10 FIELD COLUMBIAN MusEUM—GEOLOGY, VOL. II. 
POLY COU tes. | 
Cope, Proc. Amer. Phil, So0exi1 7, ome | 
*LATIPINNIS Cope, lL. .c.; Ext. Batrachia; etc. 36, pl. 1, qigeeeeuns 
Rep. U. S. Geol. Surv. 1871, 388; ibid. 1872, 326,335 iauas 
U. S. Geol. Surv. Terr. 27,1874; Cretac. Vértebraraeea seme 
255, 1, vil, ff. 7, 7a; Leidy, Ext. Vert. Fauna, 279.— Niobrara 
Cretaceous of Kansas. 
*ISCHIADICUS Williston, postea, Niobrara Cretaceous, Kansas. 
This genus was based upon a portion of a propodial bone and 
imperfect cervical and dorsal vertebre. The ribs of the neck are 
single-headed. 
PIRATOSAURUS. 
Leidy, Cretaceous Rept. N. Amer. p. 29, 1865. 
PLICATUS Leidy, l..c. pl. xix, fig. 8.—Cretaceous, Minnesota. 
Based upon a single tooth. Believed by the author to be Cro- 
codilian. The horizon is probably Niobrara, judging from the 
accompanying fossils. If so, it would seem very probable that the 
tooth belongs to a plesiosaur, though rather sharply conical in shape. 
NOTHOSAUROPS. 
Leidy, Proc. Acad. Nat. Sci.. Phil. 1870, 74. 
occibuus Leidy, |. c.; Rep. Geol) Surv.’ Lerrs1873) 1534550 ee 
11-23; Cope, Bull. U.S. Geol. Surv. Terr. 1, 28, 1874 (Pleszo- 
saurus);Cretac. Vert. 1875, 256 (zd. ).—Laramie | ?] Cretaceous, 
Dakota. | 
TAPHROSAURUS: 
Cope, ‘Proe; Amer. -Phippoce xe 74, eto7o 
LOCKWOOD! Cope, Ext. Batrachia, etc. 1869, 40 (P/estosaurus); Proc. 
Amer. Phil. Soc. x1, 274.—-Cretaceous No. 1, New Jersey. 
OLIGOSIMUS. 
Leidy, Proc. Acad. Nat. Sci. Phil. 1872, 39 (1873). 
GRAND&vuS Leidy, 1. c. 40; Extinct Vert. Fauna, 286, 345, pl. xvi, 
lado hsb hepa ea 
This genus and species were proposed for a detached caudal 
vertebra of small size, without definite horizon, from Green River, 
