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Almost immediately there was a furious splashing, and by the aid of the glass I distinctly saw the dorsal fins of several sharks darting here and there among them, whilst over the glassy surface of the water a shriek or two came faintly towards us.
Saw a young Emperor this morning, and whilst trying to capture it one of Wilson's new whales with the sabre dorsal fin rose close to the ship. I estimated this fin to be 4 feet high. It is pretty to see the snow petrel and Antarctic petrel diving on to the upturned and flooded floes. The wash of water sweeps the Euphausia across such submerged ice.
It appears that in the imperfect condition of the vertebral column, and the inferior situation of the mouth in the pterichthys, coccosteus, &c., there is an analogy to the form of the dorsal cord and position of the mouth in the embryo of perfect fishes. The one-sided form of the tail in the osteolepis &c. finds a similar analogy in the form of the tail in the embryo of the salmon.
There was no distinguishing mark yet formed but the dewlap below the throat. The dorsal spines, the large erect scales, all those appendages that render the iguana so remarkable when it attains its full growth, were scarcely traceable.
Bracing my feet against the cross-beam of my little oaken table, I opposed to the mahogany partition behind me the vigorous dorsal resistance that must have expressed the old-English idea of repose. The sturdy screen refused even to creak, but my poor Yankee joints made up the deficiency.
The bones found were the pelvis that is, the two hip-bones and six vertebrae, or joints of the backbone. Having discovered these, the police dammed the stream and pumped the pond dry, but no other bones were found; which is rather odd, as there should have been a pair of ribs belonging to the upper vertebra the twelfth dorsal vertebra.
The sexes often differ greatly in various external characters. The male of the above-mentioned Anolis is furnished with a crest which runs along the back and tail, and can be erected at pleasure; but of this crest the female does not exhibit a trace. In the Indian Cophotis ceylanica, the female has a dorsal crest, though much less developed than in the male; and so it is, as Dr.
But indeed it is not at all easy to see how the influence of the surface of the ground or any conceivable condition or force can produce the difference which exists between the ventral and dorsal shields of the carapace of a tortoise, or by what differences of merely external causes the ovaries of the two sides of the body can be made equal in a bat and unequal in a bird.
During our stay, I observed the habits of some marine animals. A large Aplysia is very common. This sea-slug is about five inches long; and is of a dirty yellowish colour, veined with purple. On each side of the lower surface, or foot, there is a broad membrane, which appears sometimes to act as a ventilator, in causing a current of water to flow over the dorsal branchiae or lungs.
The former belonged to the Siluridae, and had four fleshy appendages on the lower lip, and two on the upper; dorsal fin 1 spine 6 rays, and an adipose fin, pectoral 1 spine 8 rays; ventral 6 rays; anal 17 rays; caudal 17-18 rays; velvety teeth in the upper and lower jaws, and in the palatal bones.
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