PERMIAN VERTEBRATES 7 21 



Teeth. — -There are several isolated teeth or portions of jaws with teeth 

 attached, which cannot be assigned to any of the described forms. It is 

 probable that if more complete material were at hand they would be found 

 to belong to forms already described, either from Illinois or Texas. 



''Species one" Cope, 1877, Proc Am. Phil. Soc, p. 56. 

 This is an incomplete maxillary with six broken teeth. "They stand in 

 close juxtaposition and are of equal size. The basal half or more of the 

 crown displays the character of deep inflections or grooves. These teeth 

 belong to some sauroid fish or batrachian." Plate V, Fig. 12. [No. 6566.] 



''Species two" Cope, 1877, Proc. Am. Phil. Soc, p. 56. 

 A fragment of a mandibular ramus with four teeth. "The anterior of 

 these is larger and is separated from the others by an edentulous space. 

 Their crowns are rather elongate and are compressed, having cutting edges 

 fore and aft. Both edges contract to the apex, but the anterior the more so. 

 There are a few shallow grooves at the base, but they appear to be superficial 

 only." As remarked by Cope, it is impossible to tell whether they belong to 

 an amphibian or a reptile. Plate V, Fig. n. [No. 6567.] 



"Species three" Cope, 1877, Proc. Am. Phil. Soc, p. 56. 



"Two stout, slightly flattened, conic teeth, without cutting edges, represent 

 this species. They are anchylosed to a very thin plate of bone, a part of 

 which adheres to each. The base is oblique, expanding more in one direc- 

 tion than in another. The greater part of the crown is marked by closely 

 placed parallel grooves, which are more numerous than in the species 

 No. 1. They are larger than those of No. 2, measuring .004" 1 in diameter at 

 the base. They may belong to any one of a number of known genera of 

 batrachia or sauroid fishes." [No. 6568.] 



Besides these, there are two teeth that seem to indicate forms not other- 

 wise represented in the collection. The first is rather conical and recurved, 

 the upper end truncate, but the inner side shows a concave region of wear 

 against the opposed tooth. This would seem to show that it is either an 

 incisor or one of the lateral teeth, probably the first, of some member of 

 the Diadectidce. Plate V, Fig. 23, a and b. [No. 6569.] 



The second is a very stout, conical tooth, much larger than any other in 

 the collection. Its surface is marked with deep, irregularly arranged 

 grooves. Plate V, Fig. 24. [No. 6570.] 



A lower jaw, nearly complete, resembles very closely that of Pariotichus 

 from Texas. The articular region is complete and shows a well formed 

 face and a prominent spur extending posterior to the cotylus. Fragments of 

 other jaws show the same feature. The outer side is marked by strong retic- 

 ulate sculpture, which at the posterior part seems to radiate from a point on 



