OHIKOCENXEIDJS. 
107 
The following species have also been based upon fragmentary 
remains of jaws with teeth, but are not represented in the 
Collection : — 
Ichthyodectes acanthictis, E. I). Cope, Proc. Amer. Phil. Soc. 
vol. xvii. (1878), p. 177. — Upper Cretaceous ; Kansas. 
[Dentary, &c. ; Cope Collection.] 
Ichthyodectes cruentus, O. P. Hay, Amer. Journ. Sci. [4] vol. vi. 
(1898), p. 225, woodc. 1. — Upper Cretaceous ; Butte 
Creek, W. Kansas. [Imperfect maxilla.] 
Ichthyodectes yoodeanus, E. D. Cope, Proc. Amer. Phil. Soc. 
vol. xvii. (1878), p. 176. — Upper Cretaceous; Kansas. 
[Maxilla and promaxilla ; Cope Collection.] 
Ichthyodectes hamatus, E. D. Cope, Proc. Amor. Phil. Soc. vol. xii. 
(1872), p. 340, and Vert. Cret. Form. West (1875), 
p. 209, pi. xlvi. fig. 5 ; O. P. Hay, Amer. Journ. Sci. [4] 
vol. vi. (1898), p. 225 ; F. B. Loomis, Palreontogr. 
vol. xlvi. (1900), p. 243, pi. xxiii. fig. 9.— Upper Cre- 
taceous (Niobrara Group) ; Kansas. [Imperfect jaws, 
&c. ; Cope Collection.] 
Ichthyodectes multidentatus , E. D. Cope, Proc. Amer. Phil. Soc. 
vol. xii. (1872), p. 342, and Vert. Cret. Form. West 
(1875), p. 212, pi. 1. figs. 6, 7 ; F. B. Loomis, Palreontogr. 
vol. xlvi. (1900), p. 243.— Upper Cretaceous (Niobrara 
Group) ; Kansas. [Premaxilla and imperfect maxilla ; 
Cope Collection.] 
Ichthyodectes proynathus, E. D. Cope, Proc. Amer. Phil. Soc. 
vol. xii. (1872), p. 341, and Vert. Crot. Form. West 
(1875), p. 210, pi. xlvi. figs. 6-10. Saurocephalus pro- 
ynathus , E. D. Cope, Proc. Amer. Phil. Soc. vol. xi. (IS* 1 ), 
p. 532. — Upper Cretaceous ( Niobrara Group); Kansas. 
[Premaxilla, maxilla, &c. ; Cope Collection.] 
The name Ichthyodectes perniciosus was given by Cope to a portion 
of pectoral fin of Protosphyrcena (see Part III. p. 414). 
Genus CLADOCYCLUS, Agassiz. 
[Edinb. New Phil. Journ. vol. xxx. 1841, p. 83.] 
Syn. Anccdopoyon , E. D. Cope, Proc. Amer. Phil. Soc. vol. xii. 1871, 
p. 53. 
Trunk laterally compressed and somowhat deeper than the head ; 
abdomen trenchant. Cleft of mouth directed sharply upwards, and 
not extending beyond the hinder border of the orbit; maxilla 
robust, with one supramaxillary bone ; dentition feeble. Vertebral 
