188 University of Kansas Geological Survey. 



Platecarpus simvis. 



Lestosaurus simus Marsh, Amer. Journ. Sci., June, 1872. 



"There are eleven teeth in the maxilla, and thirteen in the 

 mandible. The teeth have their external faces faceted, and 

 marked with irregular striae, and the inner side strongly striate. 

 The quadrate is large, with a stout elongated hook. The inter- 

 nal angle is nearly a right angle. The distal articular face is 

 prominently convex, with its anterior margin but slightly in- 

 flected. There is a large tubercle on the inner margin of the 

 hook opposite the meatal pit, but no articular button. The 

 cervical and dorsal vertebrae have transverse, broadly oval ar- 

 ticular faces, slightly emarginated above for the neural canal. 



"Length of alveolar portion of dentary 275mm. 



Length of quadrate 93 



Length of axis with odontoid 98 



Length of centrum of first dorsal vertebra 58 



Length of humerus 141 



Length of radius 99 



Length of ulna 104 



Length of ilium 153 



Length of ischium 138 



Length of pubis 175 



Length of femur 116 



Length of tibia 56 



"This species may be distinguished from Liodon curtirostris 

 Cope, perhaps its nearest known ally, but a smaller species, by 

 the number of teeth in the maxillary, which are eleven instead 

 of ten, by the more anterior nareal expanse, and by the supra- 

 occipital keel, which is inclined obliquely forward. The two 

 latter characters separate it also from Holcodus coryphseus Cope, 

 from which it likewise differs in its large quadrate. Smoky 

 Hill river." All utterly worthless characters. 



Platecarpus planifrons. 



CUdastes planifrons Cope, Hayden's Bull. U. S. Geol. Surv., No. 2, p. 31, 

 31, 1874; Cret. Vert., 135, 265, pis. xxn, xxm, ff. 1-13; xxxv, f. 16. 



? Sironectes anquliferus Cope, Bull. U. S. Geol. Surv., No. 2, p. 34; Cret. 

 Vert., 139, 267, pis. xxxin, ff. 16-18; xxxiv, 1-15, 1875. 



The material upon which this species was based is " a large 

 part of the cranium, including the quadrate bone, cervical and 



