530 
ACTIX0PTERYG1I. 
appears to be related to Thrissojos, but it is too imperfectly known 
for definite reference. The type species is E. brongniarti (H. E. 
Sauvage, ibid. p. 629, pi. xiii. fig. 2), founded on a fish wanting the 
end of the caudal region but originally about 0'1 in length, from 
the Kimmeridgian of Morestel, Isere. Both dorsal and anal fins 
are extended and the pelvic fins are remote, arising immediately in 
advance of the origin of the dorsal. 
The undefined generic name Cteuolepis (L. Agassiz, Poiss. Eoss. 
vol. ii. pt. ii. 1844, p. 180) is applied to certain detached scales of 
Bathonian age, which probably belong to a member either of the 
Oligopleuridse or of the Leptolepidae. The typical species is 
C. cydus (L. Agassiz, ibid. p. 180 ; A. S. Woodward, Proc. Geol. 
Assoc, vol. xi. 1890, p. 301, and vol. xii. 1892, p. 241, pi. iv. 
figs. 5-8; figures by C. Prevost, Ann. Sci. Nat. vol. iv. 1825, 
pi. xviii. fig. 21, and by J. Phillips, Geol. Oxford, 1871, p. 182, 
fig. 41, nos. 1-4) from the Stonesfield Slate, Stonesfield, Oxfordshire. 
The scales have only been found detached and are mostly imperfect. 
They must have been very deeply imbricating, and the anterior 
overlapped border is ragged, a few radiating grooves extending to it 
from the centre of the scale ; the relatively small exposed area is 
invested with smooth ganoine which exhibits sparse punctations ; 
and the hinder border is either entire or only feebly crenulated. 
The following scales from Stonesfield are of this character:—• 
P. 745, P. 3354. Eour typical scales figured in Proc. Geol. Assoc, 
vol. xii. (1892), pi. iv. figs. 5-8. 
Egerton 4' Enniskillen Colls. 
P. 745 a-g, P. 3354 a-k. Ei ghteen specimens. 
Egerton 4’ Enniskillen Colls. 
47931. One scale. Presented by the Hon. Robert Mar sham, 1877. 
