CHIIiOCEXTRID^. 
107 
The following species have also been based upon fragmentary 
remains of jaws with teeth, but are not represented in the 
Collection :— 
^ Iclithyodectes acantliicus, E. D. Cope, Proc. Amer. Phil. Soc. 
vol. xvii. (1878), p. 177.—Tipper Cretaceous ; Kansas. 
[Dentary, &c.; Cope Collection.] 
Iclithyodectes cruentus, 0. P. Hay, Amer. Journ. Sci. [4] vol. vi. 
(1898), p. 225, woodc. 1.—Upper Cretaceous; Butte 
Creek, \Y. Kansas. [Imperfect maxilla.] 
Iclithyodectes goodeanus, E. D. Cope, Proc. Amer. Phil. Soc. 
vol. xvii. (1878), p. 176.—Upper Cretaceous; Kansas. 
[Maxilla and premaxilla ; Cope Collection.] 
Iclithyodectes hamatus, E. D. Cope, Proc. Amer. Phil. Soc. vol. xii. 
(1872), p. 340, and Yert. Cret. Form. TYest (1875), 
p. 209, pi. xlvi. fig. 5 ; 0. P. Hay, Amer. Journ. Sci. [4] 
vol. vi. (1898), p. 225; E. B. Loomis, Palaeontogr. 
vol. xlvi. (1900), p. 243, pi. xxiii. fig. 9.—Upper Cre¬ 
taceous (Niobrara Group) ; Kansas. [Imperfect jaws, 
&c.; Cope Collection.] 
Iclithyodectes midtidentatus^ E. D. Cope, Proc. Amer. Phil. Soc. 
vol. xii. (1872), p. 342, and Yert. Cret. Form. West 
(1875), p. 212, pi. 1. figs. 6, 7; E. B. Loomis, Palaeontogr. 
vol. xlvi. (1900), p. 243.—Upper Cretaceous (Niobrara 
Group); Kansas. [Premaxilla and imperfect maxilla ; 
Cope Collection.] 
Iclithyodectes gyvognatlms^ E. D. Cope, Proc. Amer. Phil. Soc. 
vol. xii. (1872), p. 341, and Yert. Cret. Eorm. West 
(1875), p. 210, pi. xlvi. figs. 6-10. Sauroceplicdus pro- 
gnatlms^ E. D. Cope, Proc. Amer. Phil. Soc. vol. xi. (1871), 
p. 532.—Upper Cretaceous (^Niobrara Group); .Kansas. 
[Premaxilla, maxilla, (S:c.: Cope Collection.] 
The name Ichthyodectes perniciosas was given by Cope to a portion 
of pectoral fin of Proiosphyrcena (see Part III. p. 414). 
Genus CLADOCYCLUS, Agassiz. 
[Edinb. Kew Phil. Journ. vol. xxx. 1841, p. 83.] 
Syn. Ancsdopogon, E. D. Cope, Proc. Amer. Phil. Soc. vol. xii. 1871, 
p. 53. : 
Trunk laterally'compressed and somewhat deeper than the head ; 
abdomen trenchaiit. ^eft of mouth directed sharply upwards, and 
not extending beyond the hinder border of the orbit.j^iaxilla 
robust, with one supramaxillary bone ; dentition feeble. Yertebral 
