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They could spot the location where the boys were diving easily enough, first by the floats, then by the bubbles of their exhausts. Scotty hooted suddenly, four times. Rick turned quickly in time to see a six-foot shark speed past. The tips of the pectoral fins and the second dorsal were darker than the rest of the fish, and Rick identified it as a black-tipped shark.
In consequence of these important folding-processes in the primitive gut, the simple entodermic tube divides into four different sections: 1. underneath, at the ventral side, the permanent alimentary canal or permanent gut; 2. above, at the dorsal side, the axial rod or chorda; and 3. the two coelom-sacs, which immediately sub-divide into two structures:
They not only agree in the structure of the fin, at first pointed out by Huxley, but also in the position of the pectoral, ventral, and anal fins, and in having an elongated body and rhomboidal scales. On the other hand, the tail is more symmetrical in the recent fish, which has also an apparatus of dorsal finlets of a very abnormal character, both as to number and structure.
The bones found were the pelvis that is, the two hipbones 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.
In Flat-fishes the dorsal and ventral fins extend along the whole length of the dorsal and ventral edges: the dorsal from the head, in some cases from a point anterior to the eyes, to the base of the tail, the ventral from the anus, which is pushed very far forward, to the base of the tail, and in some species of Solidae these fins are confluent with the caudal fin.
Presently the tube bends into the shape of an S, and turns spirally on an imaginary axis in such a way that the hind part comes to lie on the dorsal surface of the fore part. The united vitelline veins open into the posterior end. From the anterior end spring the aortic arches.
But on that coast this dreaded fish appears singly; it is rare to see two of them together; while Santiago harbor seems to swarm with them, the dark dorsal fin of the threatening creatures just parting the surface of the sea, and betraying their presence.
In the South American tree-frogs of the genus Nototrema the eggs are developed in a dorsal pouch of the skin of the female, and within this pouch the respiration of the embryo is carried on by a membranous expansion of the second and third external gills on each side.
But our little turbellaria, while still without a head, has one end which goes first and can be called the front end. The upper or dorsal surface is usually more colored with pigment cells than the lower or ventral surface, on which is the mouth. It has also a right and left side. It is thus bilateral.
Tucker describes a baby born in the Sloane Maternity in New York, October 1, 1894, who had a third leg hanging from a bony and fleshy union attached to the dorsal spine. The supernumerary leg was well formed and had a left foot attached to it. Larkin and Jones mention the removal of a meningocele and a supernumerary limb from an infant of four months.
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