216 
ACT1N0PTERTGIT. 
inwards to the ethmoidal region, also slightly deep® 110 
again in its hinder third, where it hears the spaced seri 
of comparatively large teeth. Its lower margin 1 
ornamented with fine tubercles throughout its len n 
The supramaxilla, prcmaxilla, and dentary are al»o ,B1 
perfectly preserved ; and part of the thickened ec ^ 
pterygoid is exposed within. The lower end of t 
^ and its 
preoperculum bears tho usual posterior spine 
narrow bond at 
The 
fine tubercular ornament extends in a — 
least halfway up the ascending limb of the bone. ^ 
operculum is ornamented with close radiating lines o 
tubercles ; and the more delicately marked suboperc 
is shown to be relatively small. The clavicle is P al 
ornamented with elongated tubercles in radiating st,n ^ 
and the supraclavicle exhibits longitudinal ron® 
tubercles in its exposed hinder half. Enniskill en 
P. 4537, -a. Fine small head with opercular apparatus, and a ® 
imperfect specimen ; Burham. Enniskillen 
35104, -05. Remains of a smaller head with vertebrae, oho pa 
of 
another small head in two pieces ; Rochester, Kent, 
the first specimen the great extent of the premaxi 
well shown. Purchased, 
47298. Remains of an equally small head and abdominal 
with traces of the dorsal and paired fins ; Lower 
Dover. Judging from sections of the constricted ver ^ 
centra, a persistent thread of notochord seems o 
pierced them. Gardner CoU. 
P. 9252. Remains of large 
English Chalk. 
head, the mandible 0-09 in 
length ; 
History unknown. 
r wer Ch ! 'lk’ 
47916. More fragmentary remains of large head ; A- 0 y§77. 
Burham. Presented by the Hon. Robert Marsha) , 
41106. Fragmentary remains of small head ; Lower Chalk, -egg. 
Kent. Purchased, 
49082. Fragmentary head showing the ornamented an ^ e ^,^ q 0 H. 
pansion of the premaxillae ; Burham. Mrs. ml 
P. 9044. Remains of small head ; Blue Bell Hill, Burham. iggR 
Presented by S. J. Hawkins, Esq., 
