90 
ACTIN OPTEET GII. 
vertebrae absent. Fin-fulcra slender; pelvic fins arising considerably 
behind the middle point between the pectoral and anal fins. Scales 
large and smooth; principal flank-scales about as deep as broad, 
with conspicuous denticulations on the hinder border; caudal flank- 
scales with a much-produced postero-inferior angle. 
Form, fy Log. Oxfordian: Huntingdonshire. 
P. 6841. An imperfect disarticulated skeleton, the type specimen ; 
Peterborough. The principal bones of the head and 
opercular apparatus are described and figured loc. cit . 
There are many portions of ribs and neural arches, but, 
except the doubtful fragment attached to the basioccipital 
bone, there are no traces of ring-vertebrae. Leeds Coll. 
P. 6838. Nearly complete fish, much fractured ; Peterborough. 
The right maxilla is preserved as described and figured, 
loc. cit. p. 562, pi. xlix. fig. 2, and the splenial bone, with 
its robust elongated teeth, is shown in position in the 
mandible ; the bases of some of the large hinder vomerine 
teeth are also exposed. The tuberculations upon the 
frontals and the operculum are stronger and more closely 
arranged than in the type specimen. The bases of the 
pectoral fins are preserved, and some of the hinder rays 
on the right side are nearly complete; the right pelvic 
fin is very incomplete, but in position, and there are frag¬ 
ments of the anal and caudal fins. The characters of the 
squamation can be observed, and the three enlarged anal 
scales occur in position. Leeds Coll . 
P. 6840. An associated series of scales, with some bones of the 
head and pectoral arch, and ribs; Peterborough. The 
parasphenoid, metapterygoid, and hyomandibular are 
described and figured loc. cit. pp. 561,562, woodc. figs. 3, 6, 
pi. 1. fig. 2. Leeds Coll. 
Lepidotus maerocheirus, Egerton. 
1845. Lepidotus macrochirus , Sir P. Egerton, Quart. Journ. Geol. Soc. 
vol. i. p. 230. 
Type. Imperfect fish, ventral aspect; British Museum. 
A species attaining a length of about 0*7 ; form and proportions 
unknown, but trunk apparently very robust and head with opercular 
apparatus occupying about one-fifth of the total length of the fish. 
External bones more or less feebly rugose and finely tuberculated, 
but in great part smooth; parietal bones somewhat less than half 
