240 



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

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

 ing the anterior teeth half-way between the large premaxillary and large max- 

 illary teeth. In E. petrosus they are much nearer the large maxillary. 



Measurements. 



M. 



Length of the premaxillary 0. C270 



Distance between the large maxillary and the premaxillary teeth 0. 0180 



Transverse diameter of the premaxillary 0. 0070 



Transverse diameter of the large maxillary tooth 0. 0026 



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

 to the genus Empo. 



Enchodus calliodon, Cope. 



The tooth 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, arc 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 are nine sharp delicate keels, which disappear as the tooth con- 

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

 length, m .02 ; longitudinal diameter at base, m .0025 ; transverse diameter 

 al base, (T.0035. The apex of the tooth is black. 



From near Fossil Spring, Western Kansas. 



ANOGMIUS, Cope. 



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



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

 tidce, and represent ed by vertebras only. One species was named A. contractus, 

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

 bling these vertebra 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 Sauwdontidoi nor of Stra- 

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

 those caa.lal vertebrae which precede those that support the caudal fin. The 

 centra are shortened, and the prolonged neural and haemal arches and spines 



