f9o3-] 



Ha}\ North American Cretaceous Fishes. 



27 



identical with Pachyrhizodus. In 1877 (Bull. U. S. Geol. and 

 Geog. Surv. Terrs., Ill, p. 584) Prof. Cope again restored his 

 genus Anogmiiis to favor, and described the new species A. 

 aratus, based on a nearly complete individual. This per- 

 mitted him to define more fully the characters of the genus. 

 In the same year he described two additional species, A. 

 favirostris and .4. cvohttus, collected for him in Kansas, by 

 Sternberg's party. 



Dr. A. S. Woodward (Cat. Foss. Fishes, IV, 1901, p. 71) 

 apparently takes the position that Cope, when he described 

 Anogmhis aratus, intended to employ the generic name in a 

 new sense, and to make A. aratus the type of the new genus. 

 Prof. Cope's language may give some justification to this 

 conclusion; but it is evident that he intended to include the 

 original species, since he cites the original description. He 

 had evidently again changed his mind regarding the generic 

 position of the type vertebrae. The vertebrae of the species 

 assigned to Anogniius and those of Pachyrhizodus resemble 

 one another closely, and Cope's vacillation is not to be won- 

 dered at as long as he possessed no other parts for comparison. 

 But in his second description (Proc. Amer. Philos. Soc, XII, 

 p. 354) he mentions characters which appear to separate the 

 two genera. One of these is found in the crowded condition 

 of the vertebras at the base of the caudal fin of Anogniius; 

 the other, in the failure of the upper and lower arches in this 

 region to become coossified 

 with their centra. Figures 

 15 and 16 of this paper 

 represent the condition of 

 this part of the vertebral 

 column. In Pachyrhizodus pig. 15. Anog»,ius Fig. 16. Ano^nius 



fViprP ic -.rM-iQ-rATifKr l^cc sp., No. 1616. X J. Cau- sp., No. iii6. X J. Cau- 

 tnere is apparently less dal vertebrae. dal vertebra. 



crowding of the vertebrae, 



and the arches become coossified with the centra. On 

 this point see Dr. Loomis's figure {op. cit., pi. xxvi, fig. 9). 

 Stewart (Univ. Geol. Surv. Kansas, VI, pi. Ixvi) presents 

 a tail of Anogniius in which the shortening and crowding 

 are less than in any that I have seen. 



