158 



REPTILIA 



CLASS III 



S K 



anteriorly. Quadrate large, with prominent supra- 

 stapedial process extending below the middle of the 

 bone ; opening for the auditory meatus large, not 

 entirely enclosed. Teeth slender and recurved, 

 facetted on the outer side, striate on the inner; 

 maxillae with about twelve, and pterygoid ten to 

 twelve teeth. Coracoid deeply emarginate on inner 

 border. Four carpals and three tarsals present, 

 closely articulating. Fifth digit shorter than the 

 fourth, and divergent. Chevron bones large, loosely 

 articulated. Abundant and represented by numerous 



Flatecarpus coryphaeiis, Cope. Upper Cretaceoiis ; Logan County, 

 Kansas. Skull, superior aud lateral aspects, 1/7 (after Merriaiii). 



species in the Upper Cretaceous of Kansas, Colorado, 

 Texas, North Dakota, and France. 



Holosaurus, Marsh. Very similar to the preceding, 

 except that the coracoids are not emarginate ; there 

 are no zygosphenes in the only known specimen. 

 Kansas. 



Flioplatecarpiis, Dollo (Oterognathus, Dollo). Similar 

 to Flatecarpus, but with smaller chevron bones. Quad- 

 rate with large meatal opening. Mandible slender, 

 coronoid rudimentary. Teeth long and slender, 

 facetted, and striate. Danian of Maestricht, and 

 Upper Senonian of Belgium. 



Prognathosaurus, Dollo. Skull about 0-6 m. long. 

 Pterygoids nearly as large as the maxillae, and with 

 very powerful teeth. The large suprastapedial process 

 of the quadrate coössifies with the infrastapedial 

 process, and encloses an oval foramen. A wide canal 



