The afternoon of the next day (24th October) I was enabled to devote to dredging operations, working over the bay at depths varying from two to twelve fathoms. From these I obtained some large and active specimens of a large wing-shell, the Strombus pugilis, whose gymnastic performances, when subsequently placed in a vessel of sea-water, excited general interest. Armed with his long powerful foot, he struck out boldly in all directions, the operculated extremity acting like a sword blade, and alarming me for the safety of the seaweeds and other more delicate organisms which occupied the same vessel. When disposed to turn about, it protruded the foot so as to half encircle the shell, and by then rapidly straightening the organ the desired change of position was effected. It was very interesting to see the complete control which the animal thus exercised over its heavy and apparently unwieldy shell. In twelve fathoms of water we came upon a great quantity of blue-spined Echini, the tangles of the dredge in one short haul bringing up about two dozen. Fishing-lines were also brought into requisition, resulting in the capture of some fishes of a pale crimson colour, belonging to the blenny family.
In the evening of this day (24th October) we sailed from St. Vincent. Up to the 29th instant the north-east trade wind proved fairly propitious, but it now failed us completely; and as we were at this time in latitude 8° N., and there were otherwise unmistakable indications of our having arrived at the "Doldrums" (the region of equatorial calms), steam was had recourse to. Under this artificial stimulus we proceeded at a rate of from five to six knots, a speed unfortunately too great for the use of the tow-net; and on this occasion the circumstance was all the more vexatious, as the surface water seemed peculiarly rich in animal life. Ultimately, however, determining on sacrificing some bunting in the cause of science, I put a tow-net over the stern, and the captain aided me materially by towing from the end of the lower studding-sail boom a ten-foot trawl-net. Between the two we succeeded in capturing some water insects of the genus Halobates, several beautiful large Ianthinæ, but unfortunately with their fragile shells partly broken and severed from their rafts; also a Physalia, a small free-swimming Actinia, some discophorous Medusæ, and several Pteropod Molluscs of the genus Hyalea. For several consecutive days the surface water after dusk was thronged with the above-mentioned Medusæ, whose tough gelatinous discs, of three inches diameter, continually clogged up the meshes of the tow-net. On the 2nd of November we obtained some Globigerina forms, several Crustaceans, some minute Pteropods of the genus Cuvieria, and a host of minute Confervæ, of the kind met with previously to the northward of Madeira. On the afternoon of the 5th of November, when we were about a hundred miles from St. Paul's Rocks, we noticed that the little petrels, which for weeks had accompanied us in great numbers, were now feebly represented, and in the evening were completely gone. Perhaps they had found out their proximity to terra firma, and were gone for a run on shore. It is very strange how these birds, which follow ships over the ocean for thousands of miles, can manage to time their journeys so as to reach land for their breeding season. That the same individuals do follow ships for such great distances we have good evidence; for Captain King, in his voyage of the Adventure and Beagle, mentions a case in which the surgeon of a ship, coming home from Australia, having caught a Cape pigeon (Daption capensis), which had been following the ship, tied a piece of ribbon to it as a mark, and then set it free. The bird, recognized in this way, was observed to follow them for a distance of no less than 5,000 miles.
From the last date to the 9th of November, but little of interest occurred. One day a petrel (Thalassidroma pelagica) had been caught with a skein of thread; and on opening the body the crop was found to contain a number of stony particles, bits of cinders, minute shells, and otolites of fishes. In the tow-net we caught a number of Rhizopods, of 1⁄20 inch diameter, which kept continually unfolding and shutting up their bodies in telescopic fashion. When quiescent, the animal is egg-shaped, and about the size of a mustard seed; but when elongated, it is twice that length, and exhibits a tubular sort of proboscis armed with an irregular circle of vibrating cilia. We also obtained a Pteropod resembling the Criseis aciculata, an Ianthina, and some hyaline amœbiform bodies, which were entirely beyond my powers of recognition. On the following day we got more of the pretty violet shells (Ianthina fragilis), several Crustaceans, including a large and perfect Glass-crab (Phyllosoma), and several large Salpæ and Medusæ.
On the 12th of November we entered the north limit of our surveying ground, being in latitude 17° S., and in the vicinity of the Abrolhos Bank. Here, in latitude 17° 18′ S., longitude 35° 34′ W., we made a cast with Bailie's deep-sea sounding apparatus; reaching bottom in 1,975 fathoms, and finding it to consist of "Globigerina mud," of a pasty tenacity, tinged with red, and containing a great mass of Globigerina tests, whole and fragmentary. Later in the day, when in latitude 17° 32′ S., longitude 35° 46′ W., we again sounded, getting bottom in 700 fathoms, and bringing up a sort of light-grey ooze. Towards evening we struck soundings in thirty-five fathoms, over the Hotspur Bank. There we made a successful haul of the dredge, finding the bottom composed of dead coral encrusted with Nullipores, Polyzoa, and slimy Algæ, and containing in its crevices some Crustaceans of the genera Actæa and Corallana, and a few Annelids. The stony masses of coral which we brought up were pierced in all directions by boring molluscs; and one specimen of a long elaborately woven sponge (which has since been described by Mr. S. O. Ridley, of the British Museum, as a new variety of Cladochalina armigera) was found attached to a lump of coral.
The next day we sounded in latitude 18° 4′ S., longitude 36° 1′ W., using the Lucas wire sounder. We reached bottom in 300 fathoms, the bull-dog apparatus bringing up fragments of coral rock encrusted with calcareous Algæ. In the afternoon we passed into deeper water, sounding over the Globigerina ooze area, in 1,395 and 2,025 fathoms. The surface water again exhibited the same conferva-like bodies which were so abundantly obtained near Madeira. The Pyrocystis noctiluca was also largely represented; and in the evening the tow-net was found to contain small cuttle-fish, some dead spirorbis shells, specimens of the Criseis aciculata, Cleodora pyramidata, and of a species of Hyalea, and a thick fleshy Pteropod, a species of Pneumodermon, small globe fishes, many long, transparent, stalk-eyed Crustaceans, and other minute members of the same class of Arthropoda.
On the 14th of November we sounded in latitude 19° 43′ S., longitude 36° 5′ W., the bottom consisting of a pale chocolate-coloured tenacious mud. Towards evening we reached the position of the Montague Bank, which is indicated on the chart as a bank about three miles long, and in one part covered by only thirty-six fathoms of water. We sounded for this bank repeatedly, but in vain, nowhere getting bottom with 470 fathoms of line. The ship was now allowed to drift during the night-time, soundings being made from time to time; and towards morning we filled our sails to a northerly breeze, and stood on for the Victoria Bank. In the afternoon we met with a large school of sperm whales (Physeter macrocephalus), displaying to advantage, as usual, their huge cylindrical snouts, and alternately their great spreading tails; this circling exercise appearing to be a favourite amusement of theirs.
On reaching the Victoria Bank,