ACTIN0PTERYG1I. 
:ula r 
exposed from above. The narrowness of the operc ^ 
apparatus and tlie form of the preoperculum are 
shown in impression. The vertebra: cannot be disf' n ° 
counted, but they do not appear to exceed 30 in 11111 
^°t more than 8 rays can be observed in either ° ^ 
pelvio fins, which are crushed together. H® d° rs ( un _ 
shows at least 18 rays, and the foremost, thoUS ‘ er j or 
divided, can scarcely be described as spines, 
rays of the anal fin do not extond any 
caudal fin than in the typical C. vexillifer . 
The p<> st 
nearer to the 
Lems 
Coll- 
Ctenothrissa radians (Agassiz). 
[Plate X. figs. 1-4.] 
1835-38. Bery.v radians, L. Agassiz, Poiss. Foss., Feuill- P- 
vol. iv. pp. 4, 118, pi. xiv b. fig. 7, pi. xiv c. figs. 7-0. 
55, ft° d 
vol- 
. rr * ’ ’ 1 v u ' U o* *t P 1 * A1V u * f 4 
1888. Beryx radians, A. S. Woodward, Proc. Geol. Assoc. 
p. 826, pi. i. fig. 9. t |( - st n 
1899. Ctenothrissa radians, A. S. Woodward, Ann. Mag. Nat. 
vol. iii. p. 491. 
Type. Imperfect fish ; British Museum. ^ 0 f 
A robust species, attaining a length of about 0 - 25. L cr> ?’ _ 
head with opercular apparatus somewhat less than the maxi 
depth of the trunk and contained about twice in the long 1 1 _ 
the pectoral arch to the base of the caudal fin. Head and I P g 
cular apparatus with a fine rugose ornament ; the supra®* 151 
remarkably short and deep; operculum about twice as <e .^7 
broad. Vertebrae approximately 40 in number. Pelvic fins ^ 
or 8 stout rays which, when adpressed to the trunk, extend °^ r _ 
anal fin: dorsal fin arising opposite a point just behind t -jpg 
tion of the pelvic fins ; anal fin, with at least 12 rays, a 
opposite the hinder end of the dorsal fin. Scales moderately ^ 
ateral line extending along the ninth series above that whic 0( j 
t ie ventral border of the flunk ; all the scales very Am b , ,j s o 
and deeply pectinated, those of the unterior portion of the h* 
slightly rugose or tuberculatcd. 
Form. $ Loe. Turonian : S.E. England. 
4029 . Type specimen, described and figured by Agassiz, 
Lower Chalk, Lewes, Sussex. The appearance 0 ^ ^ 
in front of the pelvic fins is proved by other 3 l’ ccl ® . sj g ii, 
be deceptive. Mantel 
P- 5418. Imperfect fish, displaying the characteristic m and ‘ l 
