406 THE PTJERCO EPOCH. 



superior premolars are of about equal size, and larger than the true molars, 

 but of much more simple construction. They have anterior and posterior 

 cingula (weak on the third), but none on the external or internal bases. 

 The bases of the superior true molars are wider than long, but are not so 

 much extended inwards as in the Anisomhus coniferns. Their external 

 cones have short acute apices with circular section. They are partly con- 

 fluent at the base. The ridges which form the limbs of the V originate, 

 one at the internal base of each, and unite at a more acute angle than in 

 Auisonchiis sectorius or Haploconiis lineatus. There is an external ciugulura, 

 weak on the last superior molar, and an anterior and a posterior one, but 

 no internal one. The anterior and posterior cingula are equally developed, 

 and they rise with a curve to the edge of the V, reaching it a little exterior 

 to the apex. The last superior true molar is smaller than the others, but 

 has similar proportions. 



The crown of the first inferior premolar is much smaller than that of 

 the second, and has a lenticular section. That of the second is large and 

 robust, and has a stout lenticular section. The first and second true molars 

 have a small but distinct anterior median tubercle, and a rather larger me- 

 dian posterior tubercle. The sections of the lateral posterior tubercles are 

 lenticular. The anterior pair soon become confluent on wearing, as their 

 bases are closer together than those of the posterior pair. No cingula. 



The enamel is smooth in all the specimens. 



In the second individual the malar bone is deep and flat on its external 

 face, and a slight convexity of its superior border indicates the posterior 

 edge of the orbit. The posterior edge of the last superior molar is opposite 

 the middle of this enlargement, while the notch between the posterior border 

 of the maxillaiy bone and the malar enters a little in advance of this point. 



Measurements. 



No. 1. 



u 



Lentil of iiiaxill.-iry Ixme posterior to canine, to M. iii exclusive . 033 



Lt'Djfth of liiiHe.s of nioKim ii, iii, iv, and v 020 



Dinmotow of Pm. iii ^ '"'•-'•"P"'"^"!"' ^2. 



( transvcrw 007 



Din.n..U-™ of Pm. i,. ^ '""•■'■"I"-Ht.Tior 005 



< traiisvfreo 007 



Luogeh of biiHcg of unterior six inferior molars 027 



