I regard the fragment on which this species was founded as being the terminal end, and not a section of a jaw; partly from the rounding of the lateral surfaces to the front, and chiefly from the snapped off teeth in the middle of the truncated anterior end, for they are smaller than the pair behind them, and look forward at a greater angle, so that the converging sockets of both pairs meet behind. These characters are well shown in Mr Dinkel's excellent figure, Pl. II. fig. 3_a_. Second Sup. Palæont. The palate is destroyed, and gives no clue to the bone being either lower or upper. Another specimen, rather smaller, shows the rostrum well rounded; the front is truncated at right angles to it: there is the same rounding of its lower part into the sides, and the stumps of the front pair of teeth are visible though they are again worn level with the rugose front of the snout. But the finest fragment of this species is a rostral end, (perhaps of the upper jaw) three inches long, two inches deep, and with the palate as wide. It indicates 5 teeth on a side: the front pair small, 2nd and 3rd much larger, and two pairs behind, which are smaller. The palate is flat, and attains its greatest width at the third tooth, behind which it contracts noticeably. The third tooth is more than half an inch in diameter, the fourth is 5/16ths of an inch long. The spaces between teeth seem equal to the long diameter of the sockets, which are oval and straight. The sides round into the front of the muzzle more gradually in this specimen than in the others. An impressed line runs along the median ridge of the upper surface. Just as the jaw gets narrower behind, so the well-rounded upper surface becomes more acute behind. Behind the third socket the palate measures 1-7/8 inch from side to side, and the jaw is there nearly 2 inches high. This is the most massive Pterodactyle jaw known. In the recent state it may have indicated a creature sufficiently distinguished from those to which the smaller fossils belonged, but now the divergence of characters is so slight as to be for zoological purposes of no value. It is related to O. Fittoni; the chief points of difference being the truncated muzzle, the compression behind the third tooth, the much sharper (?) dorsal ridge, and the large size of the head. XXIII. Ornithocheirus capito (Seeley). Case. Comp. Series. Tablet. =J= _c3_ 14 1