134 
ACTIfTOrTERYG II. 
Halecopsis insignis (Delvaux & Ortlieb). 
1844. Halecopsis Icevis, L. Agassiz, I’oiss. Foss. vol. v. pt- ’*• ^ 
(name only). Q6o l 
1887. Osmeroides insignis, E. Delvaux & J. Ortlieb, Ann. 
Belg. vol. xiv. M6m. p. 74, pi. iii. figs. 2-7, 10, IF geol- 
1888. Osmeroides insignis, E. Delvaux & J. Ortlieb, Ann. 
Aord, vol. xv. p. 60, pis. i., ii. 
Tp'pe. Imperfect fish ; Delvaux Collection. ^ of 
The type species, attaining a length of about 0-3. ;i j ia lf 
head with opercular apparatus contained about foul an ^ ^ 
times, maximum depth of trunk five times in the total lcn 0 ^[loS 
fish to the base of the caudal fin. Extent of dorsal fin c 'l 
about two thirds tho depth of the trunk at its insertion ; 
of anal fin only one third that of the dorsal. jhdgiufl* 
Form. Sp Loc. Lower Eocene: Chievres, near At , 
(lpresiau Formation) ; London Basin (London Clay). 
43116, 43119. Two specimens displaying remains of the ^ the 
portion of the head and part of the abdominal reg 1 ^ 
second much the smaller ; London Clay, 1 rlID ^ eaC b, 
London. The expanded preoperculum is shown ^ ^ na | > 
with traces of radiating branches from the s un 
t ° shown 
hinde f 
the 
In the large fossil the slime-canal is al s0 s " ^ the 
short branches on the postorbital cheek-plat ' ^1 is 
smaller fossil tho upper aspect of the supraoi 
exposed ; and the frontal seems to extend ^°" ”' Qn _ 
a small plate on each side in front of the otic re-, 
I Yethereli 
41721. Imperfect head and anterior scales ; London Fla), ^ 
Toulmin Sm' 111 
3 (’0Jjj.CS * 
28713 a. Branchial region with remains of vertehi® aI )S33- 
London Clay, Sheppey. Purchase • 
. j j0 nd° n 
P.1747. Nine fragmentary specimens of head and sea® £\,/Z. 
Clay, Sheppey. ^ 
P- 3845. Nino similar specimens ; London Clay, Shepp 0 ) (jgll. 
41409. Abraded specimen ; Red Crag (derived from F° n igfi9- 
Suffolk. Purchased, 
