WILLISTON AND CASE: KANSAS MOSASAURS. I7 



CLIDASTES. 



? Oeosaurus Cuvier, Ossein. Foss. 2iid ed., 328, 1824, {fide Lydekker.) 

 Clidastes Cope, Proc Acad. Nat. Sci. Phil. 18()8, p. 233; Ext. Batv. etc, p. 21, 



1870. 

 Edestosaurus Marsh, Amer. Journ. Sci. i, j). 4(7, June, 1871. 

 O. cineriarum. 



Clidastes cineriarum Gope, Proc. .Amer. PhiL Soc, 1870, p. 583; Cret. Yert. 



etc. pp. 137, 2GG, pi. xxi, ff. 14-17; Bullet. U. S. Geol. Surv. Hayden, 



iii, p. 583. 

 O. dispar. 



Edestosaurus disparM-Avah, o\). c\i. i, ]). 447, June 1871; iii, pi. xi., June, 



1872. 



O. velox. 



Edestosaurus velox Marsh, Amer. Journ Sci. i. p. 450, June, 1871. 



Edestosaurus 2nimihis Mdi'sh, ibid. p. 452. 



V Clidastes afflnis Leidy, Proc. Acad. ISIat Sci., 1870, p. 4; Rep. U. S. Geol. 



Surv., Hayden, vol. i, p. 283, 1873. 

 1 Edestosaurus dispar Marsh, op. cit. xix. pi. i, f. 1, Jan., 1880. 



O. ■Wym.ani. 



Clidastes l^^?«fl?^^■ Marsh, Amer. Journ. Sci. i, p. 451, June, 1871: iii, p. 2'J2, 



April, 1872. 

 Edestosaurus Vymani Marsh, op. cit. iii, p. 4G4, .June, 1872. 

 C. tortor. 



Edestosaurus tortor Co-pe, Proc. Amer. Phil. Soc. Dec, 1871; Marsh, op. cit. 



iii, p. 464, June, 1872. 

 Clidastes tortor Cope, Cret. "\'ert. Rep. U. S. Geol. Surv., Hayden, vol. ii, 

 pp. 48, 131, 265, pis. iv, f i: xiv, f. i: xvi, If. 2, 3; xvii, f. 1; xix, ff. 1- 

 10; xxxvi, f. 3; xxxvii, f. 2; Bullet. U. S. Geol. Surv. Hayden, vol. iii. 

 p. 583. " 

 C. stenops. 



Edestosaurus stenops Cope, Proc. Amer. Phil. Soc. p. 330, 1871 ; Marsh, Amer. 



Journ. Sci. iii, p. 464, June, 1872. 

 Clidastes stenops Cope, Cret. Yert. etc. pp. 133, 266, pis. xiv, ft'. 4, 5; xvii, !■ 

 7, 8; xviii, ff. 1-5; xxxvi, f. 4; xxxvii, f. 3; xxxviii, f. 3. 

 O. rex. 



Edostosaurus re.v Marsh, op. cit. iii, p. 462, pi. xxii, f. 1, June, 1872. 

 O. planifrons. 



Clidastes pla?iifrons Cope, Bullet. V. S. Geol. Surw No. 2, p. 31, 1874: Cret. 

 Yert. etc. pp. 135, 265, pis. xxii, xxiii. 

 O. Westii. 



C. Westii Williston, n. sp. infra. 



CLIDASTES VELOX. 



A remarkably complete specimen, referred with considerable cer- 

 tainty to this species, was obtained by ourselves in western Kansas, 

 (Butte Creek) in the summer of 1891. A brief preliminary description 

 of the specimen was given by the senior author in Science, December 



