122 
ACTINOPTERTGII. 
exposed from above. The narrowness of the opercular 
apparatus and the form of the preoperculum are well 
shown in impression. The vertebrae cannot be distinctly 
counted, but they do not appear to exceed 30 in number. 
Xot more than 8 rays can be observed in either of the 
pelvic fins, which are crushed together. The dorsal fin 
shows at least 18 rays, and the foremost, though un¬ 
divided, can scarcely be described as spines. The posterior 
ra 3 \s of the anal fin do not extend any nearer to the 
caudal fin than in the tj’pical C. vex'dlifer. Lewis ColL 
Ctenothrissa radians (Agassiz). 
[Plate X. figs. 1-4.] 
183d-38. Beryx radians, L. Agassiz, Poiss. Foss., Feiiill. p. oo, and 
vol. iv. pp. 4, 118, pi. b. fig. 7, pi. xiv c. figs. 7-9. 
1888. Beryx radians, A. S. Woodward, Proc. Geol. Assoc, vol. x. 
p. 326, pi. i. fig. 9. 
1899. Ctenothrissa radians, A. S. Woodward, Ann. Mag. Nat. Hist. [7] 
vol. iii. p. 491. 
Type. Imperfect fish ; British Museum. 
A robust species, attaining a length of about 0*25. Length of 
head with opercular apparatus somewhat less than the maximum 
depth of the trunk and contained about twice in the length from 
the pectoral arch to the base of the caudal fin. Head and oper¬ 
cular apparatus with a fine rugose ornament; the supramaxillaries 
remarkably short and deep ; operculum about twice as deep as 
broad. YertebrEe approximately 40 in number. Pelvic fins with 7 
or 8 stout rays which, when adpressed to the trunk, extend to the 
anal fin; dorsal fin arising opposite a point just behind the inser¬ 
tion of the pelvic fins ; anal fin, with at least 12 rays, arising 
opposite the hinder end of the dorsal fin. Scales moderately large; 
lateral line extending along the ninth series above that which forms 
the ventral border of the flank; all the scales very finely serrated 
and deeply pectinated, those of the anterior portion of the fish also 
slightly rugose or tuberculated. 
Form,. ^ Log. Turonian : 'S.E. England. 
4029. Type specimen, described and figured by Agassiz, loc. cit .; 
Lower Chalk, Lewes, Sussex. The appearance of a spine 
in front of the pelvic fins is proved by other specimens to 
be deceptive. Mantell Coll. 
P. 5418. Imperfect fish, displaying the characteristic mandible, 
