60 A REVISION OF THE COTYLOSAURIA OF NORTH AMERICA 



the buccal regions. On the anterior part of the mandible the fossae are distinct; on 

 the median and posterior part the ridges become linear. A narrow triangular space 

 on the external side posteriorly, with its long apex on the inferior margin, is smooth. 

 "There are two subequal obtuse teeth, on the border of each premaxillary 

 bone. I can not count the number on the maxillary, but there are four anterior to 

 the line of the anterior border of the orbit. Of these the next to the anterior one 

 is larger than the rest, though of the same shortly conic, obtuse form. These 

 teeth are rather large for the size of the skull. At a point near the middle of the 

 ramus of the mandible, where it is broken off, there may be counted five teeth in a 

 transverse series. Of these the second from the external border is the largest, and 

 has a regularly rounded crown. Six teeth may be counted on a transverse fracture 

 of the palatine bone. Of these the four external have obtusely rounded crowns, 

 and the third from the external border is the largest. The crowns of all the teeth 

 are hollow. 



"Measurements. 



"Length of cranium to transverse line connecting the posterior borders of the M 



quadrates °-°77 



Width between the same points . 082 



Length of axis of cranium to line connecting the anterior borders of the orbits . .018 



Interorbital width 032 



Longitudinal diameter of the orbit 016 



Length from orbit to nostril 015 



Projection of muzzle beyond mandible 010 



Length of alveolar edge of premaxillary . 007 



Height of crown of large maxillary tooth 0045 



Fore and aft diameter of maxillary 00 35 



Width of mandibular ramus below at middle 020" 



Revised description: This is contained in the revised description of the genus. 



Pantylus coicodus Cope. 

 Proc. Am. Phil. Soc, vol. xxxiv, 1896, p. 450. 



Type: An injured anterior half of a cranium. No. 4330 Am. Mus. Nat. Hist. 

 Cope Coll. From Texas. 



Original description: "The right dental series includes -— 41 

 eleven teeth, which are of subequal dimensions. The crowns 

 are robust and somewhat swollen at the middle, and with a /v 



small median subacute apex. The matrix covering the palate \ rf 



is rather hard, and in removing it only three internal teeth 

 were detected. Two of these are near the maxillaries, and 



. t m ' ric 10. — several maxillary teeth 



just within the last and the penultimate respectively. The of Panryius coicodus. xi. No. 

 third is opposite the antepenultimate maxillary and is as far ^^^X^^ 

 interior to it as the length of the last three maxillaries. This teristic form. xi. No. 4336 

 and the posterior palatine teeth are as large as the maxillaries, Am - Mus - 

 the other is smaller. The crowns have the same form as those of the maxillary series. 



"This species is of about the dimensions of the P. cordatus, but the palatine teeth 

 are less closely placed. The inequality in size of the maxillary teeth characteristic 

 of the P. cordatus is not seen in the P. coicodus, and the form of the crown in the 

 two species is distinct. Those of the P. cordatus are obtuse, and without the little 

 apex of the new species. In the latter the dental "crowns have nearly the form of 

 the seeds of grass, Coix lachryma. 



"Accompanying the specimen above described is a fragment of apparently a 

 dentary bone, which supports eight teeth and parts of teeth. The crowns stand 



