14 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol. 60. 



ventral margin of the posterior inframeckelian foramen. In front 

 of this foramen in Varanus the prearticular is in contact with the coro- 

 noid and it is presumed that a similar condition would prevail in the 

 completely articulated Saniwa ramus. 



The articular portion of this ramus presents from a dorsal view a 

 shallow concave, antero-posterior, but wide cotylus, behind which 

 the articular is slightly contracted, the truncated end being enlarged, 

 this latter expansion being especially pronounced in a ventral-inter- 

 nal direction. This posterior extension differs from Varaims in being 

 shorter, relatively heavier, and in the development of a hooklike inter- 

 nal-ventral expansion of this end. The pointed posterior extremity of 

 the surangular laps along the upper external side, ending about mid- 

 way between the center of the cotylus and the posterior end of the 

 ramus. 



Splenial. — Although only the thin vertically expanded posterior 

 portion of the left splenial is preserved (see B, fig. 12), an examina- 

 tion of the dentary along which this bone laps on the inner side shows 

 that in shape and extent anteriorly it is approximately the same as 

 in Varanus. It covers the inner side of the meckelian groove on the 

 dentary and extends posteriorly, overlapping the anterior ends of the 

 surangular, prearticular, and angular. It appears also to have been 

 in contact with the coronoid. 



Coronoid. — The right coronoid was found detached from the rest 

 of the jaw and in a fair state of preservation. It is a small bone, 

 curved from end to end, deeply grooved on the ventral side, which 

 sets astride of the striated superior border of the surangular. The 

 inner process that extends down to meet the prearticular is missing. 

 Anteriorly when articulated it was in contact with the dentary and 

 splenial as in Varanvs. 



TEETH. 



The teeth of Saniioa ensidens are pleurodont. The right maxillary 

 contains intact five of the six posterior teeth of the series in addition 

 to two stumps more anterior, probably the ninth and tenth, counting 

 from the back ; the left maxillary contains the basal portions of four 

 teeth ; the left dentary two, and the right dentary has the three pos- 

 terior teeth of the series, and the fifth from the back. Including three 

 detached teeth found in the matrix, there are 20 teeth in all. 



All of these teeth are sharply pointed, slightly curved backward, 

 like the saber-shaped fangs of Vararms. The teeth are compressed 

 from side to side, with trenchent borders fore and aft. The detached 

 teeth as mentioned by Leidy are hollow, with thick walls. 



As in Varanus the bases of the teeth are expanded, being anchy- 

 losed by the whole of their bases to the oblique surface of the bone 

 which on the outside lead upward to slight depressions in the alveolar 



