NATURAL SCIENCES OP PHILADELPHIA. 2fi5 



scuta and fragments of other bones. At another locality not far 

 distant, were found numerous remains of saurian bones, embracing 

 dermal and cranial pieces, coprolites, a fragmentary tooth, etc., 

 which may have some affinity to these. The species indicated by 

 the former may be named and described as follows : 



Typothokax coccinarum, Cope, genus et species nova. 



Character genericas. The fragment of jaw belonging to this 

 genus is probably maxillary in position, for the following reasons: 

 the interior face of the bone is sutural, and for the most part solid. 

 This would refer it to the position of the symph} r seal portion of 

 the dentary bone of a gavial-like form, but for other considerations. 

 Supposing the piece to be dentary, and the suture therefore verti- 

 cal, the incongruity follows that the alveolar face becomes very 

 steep, so much so as to prevent the interlocking of the teeth, 

 which become lateral in position. If, however, the jaw fragment 

 be reversed in position, and the alveolar face placed in a horizon- 

 tal position, the suture of the inner side forms a sharp angle with 

 the vertical plane, as it should on the supposition of its being the 

 maxillary bone. The wedged-shaped section necessary to fill the 

 space between it and the median plane, will then be that of the pro- 

 longed posterior spine of the premaxillary bone. The solidity of 

 this portion of the muzzle is inconsistent with the gavial genera of 

 the Jura and later times, but not with the structure of the triassic 

 Belodons. The posterior part of the inner face is, however, strongly 

 excavated, and the sutural margin exhibits an outward deflection, 

 which is either the boundary of the nostril, or the suture for the 

 apex of the prefrontal or nasal bone. In either case the nasal 

 cavity and the nostril are posterior in position in conformity with 

 the structure of the " thecodont" crocodilfa. The alveoli are large 

 and arranged in a curved line, one of them somewhat exterior in 

 position and isolated by a short diastema like a canine. Surface 

 of the bone pitted. The dermal scuta found close to the jaw frag- 

 ment have a flat upper surface marked with shallow pits rather 

 closely placed, having resemblance to an obsolete Trionyx sculp- 

 ture. Near one of the margins of the bone, the pits run out in 

 shallow grooves. A portion of a vertebral centrum found with 

 the jaw exhibits one articular face ; this is shallow, concave, of the 

 type of the Amphicoelian division of Grocodilia. The body of the 

 centrum is much compressed. 



The other remains include a portion of a dermal bone like those 

 described, and the crown of a tooth among other fragments. 

 This crown, which has lost most of its enamel, is triangular in 

 section, and somewhat curved in its long axis. A convex face is 

 directed forwards and outward (on the supposition that the tooth 

 is superior), and a nearly plane face posteriorly. The inner face 

 is worn flat by the attrition of an opposing tooth. The pulp- 

 cavity is minute or wanting. 

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