240 



a similar one on the ontcr side of the middle keel, which overlaps the two 

 posterior ones. The maxillary underlaps farther than in some species, bring- 

 iuiT the anterior teeth half-way between the large prcmaxillary and large max- 

 illary teeth. In E. i^etrosus they are much nearer the large maxillary. 



Measurements. 



M. 



Lcnstbof the prcmaxillary 0.0270 



Distance bctweou the largo maxillary ami the prcmaxillary teeth 0. 0180 



TratiRvurse diameter of the prcmaxillary 0.0070 



Trausverso aiamcter of the large maxillary tooth 0. 002G 



The type-specimen of this species was originally described as pertaining 

 to the genus Empo. 



Enchodus CALLiODON, Cope. 



The tootli on which this species rests is especially elegant. It is quite 

 slender, and gradually contracts to the acute apex. The cutting-edges, which 

 extend to the base, are on one side, and are separated in one direction by a 

 narrow, slightly convex, and perfectly smooth face. The inner face is strongly 

 convex, being more than half a circle from the middle of the length down- 

 ward. This is also smooth on its anterior and posterior aspects ; but, on the 

 inner, there arc nine sharp delicate keels, which disappear as the tooth con- 

 tracts, the last terminating with the third quarter of the length. Total 

 length, 0"'.02 ; longitudinal diameter at base, 0'".0025 ; transverse diameter 

 at base, 0'".0035. The apex of the tooth is black. 



From near Fossil Spring, Western Kansas. 



ANOGMIUS, Cope. 



Proceedings of the Americau Philosophical Society, 1871, p. 170. 



This name was applied to a genus supposed to be allied to the Saurodon- 

 tidce, and represented hy vertebra only. One species was named A. contractus, 

 Cope, /. c, which was found by Professor Mudge. I have seen nothing resem- 

 bling these vertcbnB among either of the three families above described, and 

 cannot ascertain their exact affinities without further investigation. It is clear 

 that they are not referable to the known genera of Saurodontidcc nor of Stra- 

 lodmtidce. They present a marked character in the crowding-together of 

 those caudal vertebraj which precede those that support the caudal fin. The 

 centra are shoitened, and the prolonged neural and htemal arches and spines 



