108 
ACT IX 0 PTERY G II. 
centra at least as long as deep, each impressed with two latei a 
pits , neural and haemal spines of tail much depressed and imbri 
eating. Paired fins small, with very stout rays ; dorsal fin S0IDC 
what longer than deep, opposed to the pelvic pair; [anal fin un ' 
known ]; caudal fin deeply cleft. Scales very large, mostly deeper 
t. an bioad ; ornamented in their exposed portion with numerous 
sma pittings, and marked in their covered portion by a few coD 
spicuous radiating grooves. 
This incomplete definition is based upon the typo specimen of 
Ancedopcgon Unuidens in the U.S. National Museum, several speci- 
mens of the same species in the Brazilian National Museum at Bw 
| e aneiio, and the small series of fragments from Brazil catalogue 
e ow. this fish would be referred to the genus IchtftyodecM * 
the dorsal fin were not so far forwards, as shown in a specimen m 
the Brazilian National Museum. The detached scales describe 
rom other localities under the name of Cladocyclus are doubtf 1 
ascribed to the same genus. Most of them probably belong t0 
species of Ichthyodectes and Portheus. Scales much resembling 
t ose named C. occidentalis are shown on a specimen of Ichthy odect^ 
m the Kansas University Museum. 
Cladocyclus gardneri, Agassiz. 
[Plate IX. fig. 1.] 
1841. Cladocyclus gardneri, L. Agassiz, Edinb. New Phil- Jolir "' 
vol. xxx. p. 83. „ 
1844. Cladocyclus gardneri, L. Agassiz, Poiss. Foss. vol. v. pt. i- PP 1 ’ 
is?/ 03 ’ aUd Com P tes Rendus, vol. xviii. p. 1013. SoC- 
18il. Ancedapoyon tenuidens, E. D. Cope, Proc. Amer. Phil- j 
tol. xii. p. „ 4 . [Head and anterior portion of trunk; Natio 
Museum, Washington.] 
1888. Cladocyclus gardneri, A. S. Woodward, Proc. Geol. Assoc, vo • *• 
p. 326. 
1890. Aneedopogm tenuidens = Cladocyclus gardneri, A. S. Woodw 
Geol. Mag. [3] vol. vii. p. 394. 
-TyP 6 - 1 brtions of fishes ; British Museum. . gtJ 
Ihe type species, with the head attaining a length of not W. 
t an 0 15. Dentary and premaxillary teeth small ; maxillar} t e 
veij small or absent. Orbit round, its diameter equalling a 
one fifth the length of tho head. Most of the scales much deep 
an lnoad, ornamented in their exposed portion with nuinero 
snui 1 pittings, a few broad undulations concentric with the r 
m ci margin, and some lohed furrows diverging backwards. 
orm - $ Loc - Upper Cretaceous : Province of Ceara, N. Brazi . 
