508 



PROCEEDINGS OF THE ACADEMY OF 



[July, 



less similar. Caudal peduncle compressed, its least depth about equal 

 to its length from base of anal membrane. 



Head large, very broad, robust, l^roader posteriorly, and upper profile 

 a trifle conca\'e. Upper surface of head more or less flattened medianly , 

 lower surface more or less convex. Snout short, very broad, flattened 

 or only a trifle convex, when viewed from above l)oth its margin and 

 that of upper jaw, which is closely parallel, emarginate. Eyes small, a 

 trifle longer than broad, rounded, superior though well separated and 



¥\g. 12. — Leptosynanceia greenmani Fowler. 



placed near first third of length in head. Maxillary nearly vertical, 

 distally well expanded, so that its posterior margin is about level with 

 anterior nostril. Mandible thick, heavy, nearly vertical, convex, and 

 well protruded. Teeth minute, in rather broad bands which do not 

 meet anteriorly though approaching close. No teeth on roof of mouth 

 anteriorly or on tongue. Tongue very large, broad, thick, and only 

 free around edges. Anterior nostrils each in a short tube about as far 

 apart as interorbital space and close to edge of snout. Posterior nos- 



