68 



disappears in front of the posterior margin. Anteriorly, it terminates in a 

 short, obtuse hypapophysis. The suture of the neural arch is very coarse. 

 Surface of the bone smooth. 



Measurements. 



M. 



Length of the centrum - - 0. 037 



Diameter of the centrum anteriorly : 



Vertical 0.032 



Horlzoutal 0.031 



Diameter of the ceutrum posteriorly : 



Vertical 0.033 



Horizontal 0.031 



Length ot the surface of the parapophysis 0.015 



As compared with the H. rogersii of the New Jersey Cretaceous, this 

 vertebra is shorter and stouter, and the extremities less concave ; the suture 

 for the neural spine is much coarser. 



This crocodile was discovered in a bluish stratum, encountered in digging 

 a well in Brookville, Kansas.^ This point is considerably east of the, expos- 

 ure of Cretaceous rocks seen near Forts Hays and Wallace. It was the first 

 of the Crocodilia found between the Tertiaries of the Rocky Mountains and 

 the Cretaceous of New Jersey. 



It was given me by my friend Dr. William E. Webb, of Topcka, to 

 whom science is also indebted for the Polycotylus latijr'mnis. I have dedicated 

 this species to him. 



BOTTOSAURUS, Agass. 



Cope, Proceedings of the American Philosophical Society for 1871, 48. 

 BoTTOSAURUS PERRUGOSUS, Cope. 



Represented by numerous fragments, with vertebrae and portions of skull, 

 which accompanied the dinosaurian and turtle remains from Eastern Colorado, 

 already alluded to. 



A portion of the left dentary-bone, containing alveoli for ten teeth, shows 

 that this species iS' not a gavial. The dental series passes in a curve from the 

 iimer to the outer sides of the bone; one or two alveoli behind being probably 

 bounded on the inner side by the splenial only, as in B. macrorkynchus, when 

 that bone is in place. The dentary is compressed at this point ; in front, it 

 is depressed. TheTe is a slight difference in the sizes of the alveoli, but not 

 such as is usual in Tertiary crocodiles. Tlie external face of the bone exhib- 



' This stratum is similar to that iu which Dr. Hayden found the fish Apaopclix aaiiriformis a'i 

 Hunker Hill. 



