176 



LAB YRINTHODONTIA , 



bodies perforated ; first vertebra articulating with skull by a simple 

 undifferentiated surface. Tail apparently long. 

 Hob. Worth America (Texas). 



Cricotus heteroclitus, Cope l . 

 Syn. Cricotus discophorus, Cope 2 . 

 The type species. The vertebral centrum on which C. discophorus 



Pig. 42. 



Cricotus heteroclitus. — Ventral scutes (A) and frontal aspect of the cranium 

 (B) ; from the reputed Permian of Texas. -J. (After Cope.) 



was described has a length of 0,009, and a transverse diameter of 

 0,025. Length of skull about 0,200. 

 Hah. North America (Texas). 



R. 577. Four vertebral centra, some or all of which are referable to 



1 Proc. Ac. Nat. Sci. Philad. 1875, p. 405. 



- Proc. Amer. Phil. Soc. vol. xvii. p. 186 (1877), 



