PLATE XVIa. 
PERMIAN VERTEBRATES. SKULL AND VENTRAL ARMOR OF CRICOTUS 
Fig. 1. Cricotus crassidiscus. Cope, 1884. Portion of ventral armor, pelvic region, natural 
size. Co-type. Am. Mus. No. 4550, Cope Coll. 
Fia. 2. Cricotus crassidiscus Cope, 1884. Skull and lower jaws, top and side views, natural size, 
Co-type (lectotype) No. 4550a, figured on pl. xvi. a 
ra 

