190 University of Kansas Geological Survey. 



and a deep semicircular excavation under the hook and behind 

 the meatus. The cervical vertebrae are small, their articular 

 ends elliptical, with no superior emargination. Rudimentary 

 zygosphene present. Distinguished from L. curtirostris and H. 

 coryphaeus Cope by the number of teeth in the jaws, or palatines. 

 Smoky Hill river. 



"Width of frontals between posterior angles 115mm. 



Width in front of orbits 85 



Length of quadrates 77 



Length o«f axis with odontoid process 68 



Platecarpus clidastoid.es. 



Platecarpus clidastoides Merriam, Ueber die Pyth. der Kans.-Kreide. 30. 



"This species is based upon a parietal, the entire occiput, 

 the quadrato jugal [prosquamosal] , the atlas, some dorsal and 

 three caudal vertebrae. It is characterized by the peculiar 

 parietal, that shows anteriorly a low, three-cornered field, in 

 whose middle is the comparatively small, round pineal foramen, 

 which is situated remote from the coronal suture. The parietal 

 is vertically flattened at its posterior end, and shows much re- 

 semblance to that of Clidastes. The entire appearance of this 

 bone is different throughout from that of other species of Plate- 

 carpus. That the species belongs to this genus is shown by the 

 perforate basioccipital, and the Platecarpus-like lateral piece of 

 the atlas. The vertebra? are so much crushed and weathered 

 that they can be distinguished neither as belonging to Clidastes 

 nor Platecarpus." Translation from Merriam, 1. c. The speci- 

 men was collected by Sternberg on the Smoky Hill river, 

 though whether from the Niobrara or Pierre is not certain. 



Platecarpus oxyrliiims. 



Platecarpus oxyrhinus Merriam, Ueber die Pyth. der Kans.-Kreide, 30. 



"This species is based upon two maxillae, a premaxilla, 

 fragments of a dental, transverse, femur, and ulna. The char- 

 acter by which it is strongly distinguished from all other species, 

 is the elongation of the rostrum, as in Clidastes, only the elonga- 

 tion is not as great." Translation from Merriam, I.e. The lo- 

 cality and the collector are the same as of the preceding species. 



