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On examining the arrangement of the parts within, we find the nervous cord, consisting of two chains of swellings, or nerve-knots, resting upon the floor or under side of the body; and the heart, or dorsal vessel, situated just under the skin of the back; and in looking at living caterpillars, such as the cut-worm, and many thin-skinned aquatic larvæ, we can see this long tubular heart pulsating about as often as our own heart, and when the insect is held against its will, or is agitated, the rapidity of the pulsations increases just as with us.
With a great effort Mr. Lavender arranged his costume, and closed his eyes. "How many lie like this, staring at the blue heavens!" he thought. "Where has it got you?" said a voice; and he saw the young lady bending over him. "'In the dorsal region, I think," said Mr. Lavender. "But I suffer more from the thought that I that you "
During these important processes, that take place in just the same way in the Amphioxus, a tail-like projection grows out of the posterior end of the larva-body, and the larva folds itself up within the round ovolemma in such a way that the dorsal side is curved and the tail is forced on to the ventral side.
So sparse were the flying fish that nearly a week more elapsed before the last one on board saw his first flying fish. As for the dolphin, bonita, porpoise, and all the other hordes of life there weren't any. Not even a shark broke surface with his ominous dorsal fin. Bert took a dip daily under the bowsprit, hanging on to the stays and dragging his body through the water.
He answered in low, hoarse whispers that he had been lying in the mud and rain for several days. Then he turned his eyes up so that only the whites were visible. They remained rigidly fixed in that position. He received a dorsal injection, being too weak for chloroform. The shattered thigh was painted with picric acid and the tourniquet tightened above the injury.
Its length averages from eight to fourteen feet; there is no dorsal fin, and the tail is horizontal; colour blue, and white beneath. Its means of propulsion are two paddles, with which it also crawls along the bottom, and beneath which are situated the udders, with teats exactly like a cow's.
Its occupant was paddling with more strength than dexterity, and made his approach along the zigzag line of most resistance. Koogah's head dropped to his work again, and on the ivory tusk between his knees he scratched the dorsal fin of a fish the like of which never swam in the sea.
The excretory organs, kidneys, are composed primitively of nephridial tubes like those of the schematic worm or annelid, but immensely increased in number, modified, and improved in certain very important particulars. The muscles in simplest forms are composed of heavy longitudinal bands, especially developed toward the dorsal surface of the body to the right and left of the axial skeleton.
The bottles were slung to an oar which was stuck upright in the taffrail aft; and placing themselves close to the windlass, my two associates secured a range of some forty or fifty feet along the deck. Now and then a grampus would divert their attention; and every time the fish rose, a bullet was lodged, or attempted to be lodged, in his huge dorsal fin.
In the Trumpeter this enters a protuberance that stands out on the dorsal aspect of the sternum, which is wanting in both the other kinds. It may be that this arrangement has something to do with his peculiar note, which differs altogether from that of the others. It is much fuller and louder, and at a distance bears a considerable resemblance to the trumpet or French horn.
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