458 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



dimensions are as follows : Total length of the fragment, 325 mm. ; 

 breadth at posterior end, 49 mm. ; breadth at anterior end, 33 ; 

 breadth of the two premaxillae at the posterior end, 26 ; the same at 

 the anterior end, 24; breadth of palate at the middle of the length 

 of the fragment, 39; breadth between alveoli (transverse) at the 

 same point, 26; space between adjoining alveoli, 7; length of an 

 anterior alveolus, 7.5 ; breadth of the same, 6 ; length of a posterior 

 alveolus; 6; breadth of the same, 4; depth of the beak at the anterior 

 end, 19; depth at the posterior end, 28. 



The beak is broad and depressed, especially at the anterior end, 

 where, however, it is not complete. The premaxillse are high and 

 rounded posteriorly, low and flattened anteriorly. Together they 

 are nearly as wide anteriorly as posteriorly, and on account of their 

 being depressed look wider. The maxillae are triangular in section, 

 with a rounded external free margin. The palate is flat, with a 

 median wedge-shaped groove. The vomer is not visible on the palate. 

 The alveoli are directed downward and forward. The anterior ones 

 are larger than the posterior. In the fragment preserved there are 22 

 on the left side and 20 on the right side. The roots of the teeth are 

 preserved in the 13th, 14th, and 17th alveoli of the right side. They 

 appear somewhat oval in section and are directed backward, but 

 are not flattened below. 



Schizo del phis crassangulum appears to be a rather common species 

 in the Miocene marls of Maryland. Among specimens from the Cal- 

 vert Cliffs in the National Museum, collected by myself, are 7 more 

 or less imperfect tympanic bullae, which are identical with the bulla 

 belonging to the type specimen ; also fragments of premaxillae and of 

 the mandibular symphysis. 



