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FOSSIL REPTILIA OF THE 



to the sockets of the fifth ( e ) and sixth (J) teeth, leaving the prominent narrow mid tract 

 to represent, as it were, the bony palate ; this part has projected below the level shown 

 between the fourth pair of teeth, behind which the thin compact wall is broken away, 

 exposing the widely cellular structure. A similar abrasion affects the upper border of the 

 skull (beyond i, fig. 1, PI. I). 



The first or anterior pair of teeth (ib., a, a) bears the same relations of size to the 

 second (b) and third (c) pairs as in Criorhynchus simus, and may be homologous with the 

 first pair in that species (Monog. cit., PI. I, fig. 1, a ) though differing so much in position 

 and direction. In the present specimen of Coloborhynchus clavirostris the crown of the 

 first, as of the second, tooth is broken off at the outlet of the socket. The shape of this 

 outlet is a full ellipse (PI. I, fig. 2, a , a) ; the long diameter, of 8 m.m., is vertical ; the 

 short diameter, of Q>\ m.m., is transverse. The size and shape of the five following 

 teeth are shown in fig. 1 ; for, as is common in Pterodactyles, the sockets open obliquely 

 upon the outer part of the alveolar border, and in the present species with a nearer 

 approach to verticality than is usual (compare PI. I, fig. 1, with PI. I, fig. 1, of the 

 Monograph of 1858, in the Pal. Soc. vol. issued in 1861). 



The present unique evidence of one of the most extraordinary of the extinct order of 

 volant Bejotilia was discovered by S. H. Beckles, Esq., F.R.S., in the Hastings Series 

 of the Wealden. 



§ 3. Pterosauria op the Kimmeridge Clay. 

 k.—Pterodactylus Manselii, Owen (Plate I, figs. 10, 11, 12, 20, 21). 



Figures 10 and 11 of PI. I show front (thenal) and back (anconal) views of a mutilated 

 proximal end of the left humerus of this rather small species of Pterodactyle. The 

 reniform articular surface of the head of the humerus (fig. 1 2, «) is somewhat less extended 

 transversely in proportion to its breadth than in a similarly sized species from the Lias 

 {Pterodactylas Harden, ib., fig. 9) ; its anconal convex border has a bolder curve. 

 There is no indication of a pneumatic orifice on this surface, as in Birds. The pectoral 

 process (b, figs. 10 and 11) stand out more abruptly from a less extended base (compare 

 with 6, figs. 7 and 8, PI. I). 



The proximal end of the first phalanx of the fourth or wing-finger, which is the 

 subject of figs. 20, 21, 21 x , corresponds in size with the portions of humerus above 

 described, near which they were discovered. The olecranoid process (ib., fig. 21, c ) led 

 observers of the first discovered specimens of this eminently pterosaurian bone to regard 

 it as an ulna. Upon this process is extended part of both the outer and inner concave 

 articular surfaces, so placed as to resemble the two divisions of the ' greater sigmoid 



