l^'on] the hares and their allies 



427 



Postorbital process small, represented by the posterior limb only, 

 which forms the outer border of a well-marked posterior notch. 



The bony palate is long, its length equaling four times the length 

 of M^, its posterior third is formed by the horizontal plates of the 

 palate bones. Its length is greater than the width of the choanae. 

 and is greater than the greatest width of the incisive foramina taken 

 together. 



The incisive foramina themselves are smaller than in any other 

 genus except Pcnfalagiis ; their shape taken together is that of an 

 elongated triangle. 



The zygoma is deep, its posterior free extremity long. Its antero- 

 inferior angle is not enlarged. 



The audital bullae are small, resembling those of Pronolagus and 

 Pentalagtis. 



Teeth. — First upper incisor, groove on anterior face, deep, simple, 

 and filled with cement (Major '99, p. 468, No. viii). The first 

 upper molariform tooth has the usual three reentrant angles on its 

 anterior surface very deep, much as they are in Pronolagus; the 

 sides of the angle are not crenated. The second, third, fourth, and 

 fifth upper molariform teeth have each the usual deep reentrant angle 

 on the internal face extending about four-fifths of the distance across 

 each tooth. The sides of these reentrant angles are close together 

 throughout their whole extent, and are strongly crenated in the first 

 two of these teeth, moderately crenated in the third, and scarcely at 

 all in the fourth. The last upper molar is very small, elliptic in 

 outline, with a transverse diameter between a fourth and a fifth of 

 the transverse diameter of the other upper jaw teeth. 



The first lower molariform tooth is divided, by the usual deep re- 

 entrant angle from the external face, into an anterior and a posterior 

 portion. The anterior face of the anterior portion has two narrow 

 reentrant angles, and the external and internal faces of this portion 

 have a single broad reentrant angle each. The second, third, and 

 fourth lower molariform teeth are divided into the usual anterior and 

 posterior portions by a well-marked reentrant angle extending from 

 the external face across the tooth, the posterior limb of the angle 

 being crenated. The posterior portion of the second lower molari- 

 form tooth has a transverse diameter about five-sixths the transverse 

 diameter of the anterior portion ; the transverse diameter of the 

 posterior portion of the fourth lower molariform tooth is little more 

 than half of the same dimension of the anterior portion of the tooth. 

 The last lower molar is small, composed of a larger anterior portion, 

 elliptic in section, and a smaller posterior portion, more nearly circu- 



