ELOPID.®. 
23 
this genus has not hitherto been recognised among extinct fishes. 
To it, however, may probably be referred the following two speci- 
mens, which are too imperfect for precise determination : — 
39443. Imperfect head and abdominal region of trunk, much crushed 
and obscured by decaying pyrites ; London Clay, Sheppey. 
The length of the head with opercular apparatus is about 
014, and the distance from the base of the pectoral to 
what seems to be the origin of the pelvic fins is not less 
than 018. The middle of the cranial roof exhibits a 
depression, gradually widening from the occiput to the 
hinder border of the orbits, then somewhat contracted 
again forwards. The large posterior suborbitals and 
ossified sclerotic are conspicuous ; the very wide gape, 
prominent mandible, and gently arched maxilla are also 
shown, without any traces of teeth. The mandibular 
rami are crushed together and imperfect, thus destroying 
tho branchiostegal apparatus between them. Tart ol the 
left pectoral fin is preserved, and at the hinder end of the 
fossil there is apparently the base of the right pelvic fin. 
A well-ossified vertebral centrum, not pitted but feebly 
striated on the side, also projects through the squamation 
at the hinder end of the abdominal region. The scales 
are beautifully ornamented in their exposed portion with 
fine radiating ridges. Bowerbank Coll. 
P- 1762. Portion of trunk of the same species, also much pyritised ; 
London Clay, Sheppey. Robust vertebral centra are ex- 
hibited, each about as long as deep, not pitted at the sides 
but feebly striated ; the neural arches are broken away, 
but seem to have been fused with the contra. Portions of 
the pelvic fins are preserved, and the scales are ornamented 
as in tho last specimen. Eyerton Coll. 
The following specimen was supposed by Agassiz to represent a 
genus allied to 1 Clops : — 
P. 3846. Imperfect impression of skeleton about 0‘33 in length, 
too obscure for description and determination, labelled 
Elopides couloni by Agassiz ; Upper Eocene (slates), Engi, 
Canton Glares, Switzerland. The name is published 
without definition by Agassiz, Poiss. Eoss. vol. v. pt. ii. 
(1844), p. 139. Enniskillen Coll. 
