2i8 THE OSTEOLOGY OF THE REPTILES 



pointed. Parasphenoid large and broad. Appendicular skeleton un- 

 known, and the skull imperfectly known. 



Gymnarthrus Case, Cardiocephalus Broili, United States. 



Family Diadectidae (Diadectosauria). From about five to about 

 eight feet in length. Skull short and high. Teeth incisiform in front, 

 transversely molariform posteriorly. Vertebrae with hyposphene 

 and hypantrum. Cleithrum rather large. 



Diadectes Cope, Animasaurus Case and Williston, Bolhodon Cope, 

 Chilonyx Cope, Desmatodon Case, Diadectoides Case, Diasparactus 

 Case, United States. 



Family Bolosauridae. Teeth subcorneal, cuspidate. Small rep- 

 tiles. Teeth and part of skull only, known. Bolosaurus Cope, 

 United States. 



Family Captorhinidae (Labidosauria). From one to three feet 

 in length; invertebrate feeders. Dermosupraoccipitals confined to 

 occiput. No supratemporals and, in Lahidosaurus, no tabulars. 

 Teeth obtusely flattened, conical, in two or more rows on maxillae, 

 one or more on mandible. Cleithrum vestigial. Spines of vertebrae 

 short, their arches broad. Parasternal ribs present. 



Captorhinus Cope, Pleuristion Case, Lahidosaurus Cope, United 

 States. 



Family Pariotichidae. Small terrestrial reptiles about one foot 

 in length, insectivorous or invertebrate feeders. Teeth obtusely 

 pointed, in one or more rows. Imperfectly known. 



Pariotichus Cope, Ectocynodon Cope, Isodectes Cope, Puercosaurus 

 Williston, United States. 



Family Stephanospondylidae. Maxillae with two rows of trans- 

 verse teeth. Cleithrum large. Skull short, imperfectly known, as 

 also the skeleton. 



Stephanos pondylus Stappenbeck, Phanerosaurus Meyer, Saxony^ 

 Germany. 



Genera Incertae Sedis: ChamasaurusV^i\\iston,Archeria Case, 

 Bathyglyptus Case, Helodedes Cope, United States. 



Family LiMNOSCELiDAE. Elongate, subaquatic or marsh reptiles 

 seven or eight feet in length. Teeth conical, recurved in single rows. 



