HALOSAURID^. 
167 
Enchelurus anglicus, sp. nov. 
[Plate XII. fig. 3.] 
Type. Imperfect anterior half of fish ; British Museum. 
A large species, probably attaining a length of about 0'25. Too 
imperfectly known for precise definition, but probably similar to 
E. syriacus in general proportions. Operculum as deep as broad, 
gently rounded and not crimped at the binder border. 
Form. Log. Turonian : S.E. England. 
P. 4249. Type specimen, shown of the natural size in PL XII. 
fig. 3; Lower Chalk, probably Kent. The cranium is 
exposed from above, and its roof-bones are shown to be 
unornamented. The postorbital region is at least as 
broad as long, while the interorbital and rostral regions 
are much laterally compressed. The parietal bones {;pci.) 
are large, meeting in the middle line ; while the squa- 
mosals {sq.) cover the whole of the otic region, except 
perhaps behind. The frontals (/r.) are extremely narrow 
in their anterior half; and the slender mesethmoid {eth.\ 
which projects forwards beneath them, exhibits a slight 
expansion at its anterior end. Among the remains on 
the side of the cranium, there is a quadrate on the right, 
and an entopterygoid {enpt.') on the left. The quadrate 
bears a small ])Ostero-superior process, probably to clasp a 
S 3 ^mplectic. The entoj)terygoid is a large laminar bone, 
slightly more than twice as long as deep. Bemains of 
the premaxillee beneath the end of the mesethmoid indicate 
that they must have been relatively small, with a delicate 
rod-like extension behind. They distinctly bear very 
minute teeth. The maxilla (mx.), shown on both sides, is 
relatively very large; its anterior portion being a stout 
narrow bar extending forwards above the premaxilla, 
while its larger hinder portion is a considerable laminar 
expansion, not externallj^ ornamented. The evidence 
of teeth on this element is uncertain. The mandible 
(md.') seems to have been comparatively small, but its 
remains are imperfect and partly obscured. There is, 
however, reason to suspect that the gape was small, and 
that very little of the maxilla entered it. The left 
operculum (qp.), though somewhat fractured, shows its 
oharacteristic smoothness and rounded posterior border. 
Fragmentary remains of the vertebral axis are preserved 
as far as the pelvic fins. The anterior vertebral centra 
