EL0PIDJ3. 
45 
Kansas. [Maxilla and mandible; Palaeontological Museum, 
Munich.] 
Pachyrhizodus leptognalhus, A. Stewart, Kansas Univ. Quart. 
[A] vol. vii. (1898), p. 193, pi. xvii. fig. 1 ; F. B. Loomis, 
loc. cit. 1900, p. 264, pi. xxvi. figs. 10-16. — Upper Cre- 
taceous (Niobrara Group) ; Kansas. [Mandible, Ac. ; 
Kansas University Museum.] 
Pachyrhizodus leptopsis, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
no. 2 (1874), p. 42, and op. cit. 1875, p. 225, pi. li. 
fig. 8. — Ibid. [Fragments of mandible, &c.] 
Pachyrhizodus minimus, A. Stewart, loc. cit. [A] vol. viii. (1899), 
p. 37, woodc. — Upper Cretaceous; Butte Creek, Logan 
Co., Kansas. [Mandible; Kansas University Museum.] 
Pachyrhizodus sheared, E. D. Cope, loc. cit. 1872, p. 347, and 
op. cit. 1875, p. 225 : Oricardinus (?), E. D. Cope, Proc. 
Amor. Phil. Soc. vol. xvii. (1878), p. 177. — Upper Cre- 
taceous (Niobrara Group); Kansas. [Jaw, wanting 
teeth.] 
Pachyrhizodus velox, A. Stewart, loc. cit. [A] vol. vii. (1898), 
p. 193, pi. xvii. fig. 2.— Ibid. [Jaws ; Kansas University 
Museum.] 
An imperfect jaw of Pachyrhizodus from the Turonian (Planer- 
kalk) of Strehlen, Dresden, is described under the name of Hypsodon 
hwesiensis , Ag., by H. B. Geinitz, Palsoontogr. vol. xx. pt. ii.(1875), 
p. 222, pi. xliii. fig. 1. 
A ronewed examination of the type specimen of Mosasaurus 
gracilis, Owen, from the Chalk of Sussex, in the Brighton Museum, 
has convinced the present writer that the fossil is truly part of the 
mandible of a Mosasaurian. It was therefore wrongly named 
Pachyrhizodus gracilis in A. S. Woodward, Proc. Geol. Assoc. 
Vo1 - x. (1888), p. 314. 
The genera and speoies described as follows are supposed to be 
related to Pachyrhizodus, but are too imperfectly known for precise 
determination. They are not represented in tho Collection : — 
Cyelotomodon vagrans, E. D. Cope, Proc. Acad. Nat. Sci. Philad. 
1876, p. 113. — Phosphate Beds ; Charleston, South Caro- 
lina. [The type species. Fragment of jaw.] 
Ischyrhiza antiqua, J. Leidy, Proc. Acad. Nat. Sci. Philad. 
vol. viii. (1856), p. 256 ; E. Emmons, Rep. N. Carolina 
Geol. Surv. (1858), p. 225, figs. 47, 48.— Tertiary ; 
Neuse River, North Carolina. [Tooth.] 
