1878.] 5lO [Cope. 



ders is gentlj 1- convex downwards. The nostril is large, and is directed for- 

 wards as well as outwards : the premaxillary spines are narrow. The 

 form of the muzzle and jaws when in normal relation was vertical and 

 compressed in front. The premaxillary border of the jaw is rounded and 

 contracted behind the nostril ; the outline then expands backwards. There 

 are but two incisor teeth, of which the anterior is much larger than the 

 second. Its root is irregular in section owing to the presence of one or 

 more shallow longitudinal grooves. The pulp cavity of some of the larger 

 teeth is much contracted opposite these grooves by the corresponding inter- 

 nal face, which is disproportionately convex. The anterior two teeth of the 

 maxillary bone are larger than those that follow, the anterior exceeding- 

 even the first incisor. The other maxillaries are smaller and sub-equal, 

 excepting the last two, which are the smallest. The crowns of the teeth 

 are lenticular in transverse section, the external side being much more 

 convex than the internal. The cutting edges are defined from the con- 

 vexity of the latter by a shallow groove at the base of each. The edge is 

 not crenate as in Lmlaps and allied genera, but presents much the same ap- 

 pearance owing to the presence of a transverse corrugation. There are 

 fourteen teeth and empty alveoli in the maxillary bone. 



Measurements. M. 



Length of premaxillary axially, to middle of maxillary 



suture , 040 



Length of maxillary bone on alveolar edge from middle 



of premax. suture . 230 



Greatest width of premaxillary .086 



Depth of face of premaxillary bone at nostril 030 



Length of diastema (chord) 032 



Depth of maxillary at third tooth 110 



" " antepenultimate tooth 066 



Diameter of base of crown of first incisor tooth 015 



" first maxillary tooth 018 



fourth '■' " 009 



The portion of cranium above mentioned displays a number of peculiar- 

 ities. The orbit is lateral, and has a prominent and convex superciliary 

 border. The zygomatic arch is so curved upwards as to complete the orbit 

 behind by the intervention of a postorbital or postfrontal bone, which sepa- 

 rates the malar and squamosal bones from mutual contact. In front of 

 this bone a portion of the frontal forms the superciliary border, and in front 

 of this, the prefrontal sends a wide process behind the lachrymal to the 

 orbit. This bone resembles a nasal bone in form, and extends forwards, 

 and is decurved at the extremity. The width of the descending or malar 

 process of the postfrontal is such as to partially separate the orbit from the 

 zygomatic foSsa. The superciliary surface is swollen, and is interrupted 

 by a transverse groove on the orbital part of the prefrontal. There is a 

 vertical open groove on the malar process of the postfrontal. 



Several large pelvic bones corresponding with those which I have called 



PROC. AMEK. PHILOS. SOC. XVII. 101. 3l 



