108 
ACTIlSrOPTEEYGII. 
centra at least as long as deep, each impressed with two lateral 
pits ; neural and haemal spines of tail much depressed and imbri¬ 
cating. Paired fins small, with very stout rays; dorsal fin some¬ 
what longer than deep, opposed to the pelvic pair; [anal fin un¬ 
known]; caudal fin deeply cleft. Scales very large, mostly deeper 
than broad; ornamented in their exposed portion with numerous 
small pittings, and marked in their covered portion by a few con¬ 
spicuous radiating grooves. 
This incomplete definition is based upon the type specimen of 
Ancedopogon teniddens in the II.S. jSTational Museum, several speci¬ 
mens of the same species in the Brazilian hTational Museum at Bio 
de Janeiro, and the small series of fragments from Brazil catalogued 
below. This fish would be referred to the genus Icfiihyodectes if 
the dorsal fin were not so far forwards, as shown in a specimen in 
the Brazilian I^ational Museum. The detached scales described 
from other localities under the name of Cladocyclus are doubtfully 
ascribed to the same genus. Most of them probably belong to 
species of Ichtliyodectes and Portlieus. Scales much resembling 
those named C. occidentcdis are shown on a specimen of Ichtliyodectes 
in the Kansas IJniversity Museum. 
Cladocyclus gardneri, Agassiz. 
[Plate IX. fig. 1.] 
1841. Cladocyclus gardnei'i, L. Agassiz, Edinb. New Phil. Journ. 
vol. XXX. p. 83. 
1844. Cladocyclus gardneri, L. Agassiz, Poiss. Foss. vol. v. pt. i. pp. 8, 
103, and Comptes Bendiis, vol. xviii. p. 1013. 
1871. AruBdopogon tenuidens, E. D. Cope, Proc. Amer. Phil. Soc. 
vol. xii. p. 54. [Head and anterior portion of trunk; National 
Museum, Washington.] 
1888. Cladocyclus gardneri, A. S. Woodward, Proc. Geol. Assoc, vol. x. 
p. 326. 
1890. Ancedopogon tenuidens— Cladocyclus gardneri^ A. S. Woodward, 
Geol. Mag. [3] vol. vii. p. 394. 
Type. Portions of fishes ; British Museum. 
The type sj)ecies, with the head attaining a length of not less 
than 0*15, Dentary and premaxillary teeth small; maxillary teeth 
very small or absent. Orbit round, its diameter equalling about 
one fifth the length of the head. Most of the scales much deeper 
than broad, ornamented in their exposed portion with numerous 
small ;^ittings, a few broad .undulations concentric 'with the free 
hinder margin, and some lobed furrows diverging backwards.---- 
Form. ^ Loc. Dpper Cretaceous : Trovince of Heara, N.-lferazil, ■ 
