Stewart.] Cretaceous Fishes. 347 



bital cavity, and separated from it by the chain of bones just 

 mentioned, there is a bone that occupies about the position of 

 the ethmoid. It seems to be rather thin and crushed down on 

 the opposite side, so that its remaining characters cannot be 

 made out. 



The opercular bones are thin and scale-like and are all in 

 place. They are all covered with fine stria^ and are so thin at 

 the edges that the different directions that these stria? take is 

 the only means of locating the boundary lines between some of 

 the different bones. The preoperculum is small, narrow above, 

 and extended well forward below. The operculum is large and 

 is extended for some distance above its articulation with the 

 hyomandibular. The inter- and suboperculars extend back- 

 ward as far as the operculum. 



Anoginius evolutus. Plate LXV, figs. 8, 9, and 10: p]ate LXVII. 



Anogmius evolutus Cope, Proc. Am. Phil. Soc. 1878, p. 179. 



/>> ryxt muUidi ntatus Stewart, Kans. Univ. Quart., vol. vu, p. 196. 



This fish was first described by Professor Cope from an en- 

 tire left mandible, of which no figure is given, and I am in- 

 clined to think that it is the same form as was described by 

 myself as Beryxf m u It idc 'ntatus, m the paper containing the de- 

 scription by Professor Cope 105 having escaped my notice until 

 after my article was published. As Anogmius evolutus Cope has 

 priority, Anogmius multidentatus will have to remain a synonym, 

 unless there are other characters in Cope's specimen not men- 

 tioned in his description that will separate the two forms. 

 About the only difference is in size, and I do not consider that 

 sufficient to separate them. 



The principal points of difference between this species and 

 .1. polymicrodu8 s just described, are found in the differences in 

 form of the symphyses, the extension of the teeth over the 

 external sides of the dentaries in this species, and the differ- 

 ence in form of the cotyloid cavities. 



The dentary is elongated and slightly incurved at the syin- 



104. 1. c, p. 196. 



105. 1. c, p. 179. 



