448 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



figure, it presents some differences of specific value. The teeth are 

 larger and differently proportioned, those of the principal row being 

 relatively narrower transversely, while those of the adjacent outer row 

 are relatively \vidcr and are set less obliquely to those of the principal 

 series. It also differs from the specimens from Kansas, figured by 

 Williston and referred to C. Irowni,^ in the relatively less wide pro- 

 portions of the teeth of both series, and in the presence of the well- 

 marked apical pits. Williston's specimen seems to differ markedly 

 from Cope's type in proportions of the teeth, and perhaps should 

 have been refered to a distinct species. 



In size and proportions of the tooth rows to each other, the 

 Texas specimen here described quite nearly resembles in a general 

 way the British species, C. cantabrigiensis Woodward, from the Cam- 

 bridge Greensand, but it differs from the latter in the possession of 

 distinct apical pits or grooves and the some- 

 what wider proportions of all the teeth. 



ANOMCEODUS LATIDENS, new species. 



Type. — Portion of left splenial contain- 

 ing nearly all the teeth. (Cat. No. 2194, 

 U.S.N.M."^) See fig. 5, p. 448. 



Locality. — Nine miles west of Tupelo, 

 Mississippi. Probably Cretaceous in age. 

 Description. — Larger than A. pliasceolus 

 (Hay),^ but much smaller than A. rohustus 

 (Leidy). The teeth of the principal row in 

 general form resemble those of A. phasceo- 

 FiG. 5.-ANOMCEODUS LATIDENS. lus , but prcscut thc foUowiug characteristic 

 ^l'" ^ArsSI °' '''' ''''■ differences: They are relatively broader as 

 compared with their length, more closely 

 set together in the jaw, and are decidedly more expanded anteropos- 

 teriorly at their outer ends. Further differences are seen in the 

 teeth of the inner flanking series, which are relatively somewhat 

 smaller and are arranged opposite the interspaces instead of op- 

 posite the teeth of the principal series, as in A. phasceolus. A pecu- 

 liarity of this species seems to be the rapid decrease in transverse 

 width from behind forward of the teeth in the principal series. (See 

 fig. 5, p. 448.) 



1 Kansas Univ. Quart., vol. 9, ser. A, 1900, p. 2S, pi. 6, flg. 12. 



2 The type of this species was originally described by Leidy under the name Pycnodus faba (Proc. Acad. 

 Nat. Sci. Phila., 1872); but in 1899 Hay (Amer. Nat., vol. 33, 1899, p. 788) proposed the name P. phasceolus 

 to replace P. faba, preoccupied. The generic reference of tUs form should have been to Anomosodus and 

 not to Pycnodus. 



