78 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA 



occupies the inferior margin of the dentary bone. There is a deep auricular 

 fossa beneath the epiotic and posterior part of the pteriotic bones. There is 

 but one series of teeth on each maxillary and dentary bone exposed by the 

 present condition of the specimen. The teeth are subequal, gradually increas- 

 ing in size anteriorly, where their long diameters are transverse to the axis of 

 the dentary bone. The surface of the cranial bones is not strongly sculptured. 

 Posteriorly it is rather closely and anteriorly it is sparsely punctate. The 

 sculpture of the lower jaw is similar, except that it is smoother posteriorly." 

 Revised description: The species of Cricotus are very uncertain because 

 of lack of material. The analysis given in the original description above is 

 probably as good as any that can be given. C. hypantricus is a good species; 

 it is doubtful whether C. heteroclitus and C. crassidiscus are distinct. 



Genus CRICOTILLUS Case. 

 Cricotillus brachydens Case. 

 Second Ann. Rpt. Dept. Geol. and Nat. Hist. Territory of Oklahoma, 1902-3, p. 65. 



Type: The fragment of a rostrum. No. 349 University of Kansas. From 

 northwest of Orlando, Oklahoma. 



Original description: "A fragment of a rostrum indicates the presence 

 of a new genus and species of amphibian. The fragment is from the middle 

 portion of the maxillaries, between which appear in the posterior half the 

 anterior part of the nasals, and on the lower surface the vomers. The upper 

 surface of the maxillaries is sculptured by low longitudinal ridges, espe- 

 cially upon the upper surface. The maxillary is triangular in section, the 

 upper surface is convex, and the inner or vomerine side and the dentigerous 

 surface is flat or slightly concave. The inner or lower surfaces meet in a 

 very sharp ridge. The vomers are very narrow, but of considerable vertical 

 extent, and lie closely apposed to the vomerine sides of the maxillary; they 

 project as sharp ridges on the lower side of the skull. The teeth are repre- 

 sented by the roots alone; their chief characteristic is the relative breadth 

 of the roots, approaching in this respect the Diadectidce. They are from 

 two to three times as wide as long. The tooth line is somewhat concave 

 inwardly, following the curve of the maxillary bone, and the teeth are anchy- 

 losed to the dentigerous surfaces. 



"Measurements. 



"Total length of the fragment (about half the length of the head, ^ 



probably) 0.030 



Width of the anterior end 015 



Width of the posterior end 021" 



Fig. 20. — Cricotillus brachydens. 



No. 349 Univ. of Kansas. X i. 

 _ Diagram of a fragment, showing elon- 



n % *_§_lLy gated snout and broad bases of teeth. 



Revised description: Nothing can be added to the original descriprion. 

 The creature is distinct from any other known form, but too little of it is 

 known to fix its position. Williston (72) regards ttiis as probably not dis- 

 tinct from Crossotelos, but the point is far from being decided. 



