I. The best-preserved specimen shows pretty correctly the outline of the trunk, wanting the anterior half of the head, the whole of the tail, and all the fins. [...] The best of the two contains the opercular area of the head, the pectoral fin, and the anterior portion of the trunk of the left side of the fish seen from within ; the other shows the dorsal parts above the lateral line, and the dorsal fin. [...] The scales show partly the inner surfaces of some of the left side, and the impressions of the inner surfaces of some of the right side. [...] Fistularia, and in the 'llippocampoids' there is found the extreme of Tel eos tean modification of the mouth ; but in the most moderate degree of specialization, as in the Salmon, the hinge of the jaw is carried away from the head, first, by a double condition of the quadrate, and, secondly, by the descent of the top of the pier away from the side of the head and its attachment some distance down [...] Thickness and pitting of the surface are usually variable; the number of denticles, the points of greatest wear, and the inclination to each other of the two internal sides vary in most of the species with the position in the mouth.