528 
ACTINOPTERYGTI. 
P. 922, P. 3686. Imperfect anterior portion of fish, in counterpart; 
Kimmeridge. Egerton <$f Enniskillen Colls. 
P. 6031. Middle portion of trunk, showing part of the dorsal and 
anal fins ; Dorsetshire. 
Presented by George Clifton , Esq., 1889. 
P. 922 a, P. 3686 a. Fragments ; Kimmeridge. 
Egerton <Sf Emiskillen Colls. 
The following specimens of Thrissops are not specifically deter¬ 
mined :— 
37086. Well-preserved specimen 0*36 in length, in counterpart, 
exhibiting all the fins; Lower Kimmeridgian (Litho¬ 
graphic Stone), Solenhofen. The head with opercular 
apparatus is contained nearly seven times in the total 
length of the fish ; the maximum depth of the trunk equals 
the length of the head with opercular apparatus, and is 
contained nearly five times in the length of the trunk from 
the pectoral arch to the base of the caudal fin. Yertebrse 
and fins almost as in the type species, but the anal rela¬ 
tively more elongated by the spacing of the rays, and the 
caudal much less deeply forked, with broader lobes. 
Haberlein Coll. 
P. 937, P. 3676. Remains of slender fish originally about 0-2 in 
length, the anterior portion in counterpart; Oxford Clay, 
Christian Malford, near Chippenham, Wiltshire. The 
specimen is labelled Leptolepis costalis by Egerton, and is 
evidently intended to be the type specimen of that species 
named in Quart. Journ. Geol. Soc. vol. i. (1845), p. 231. 
The length of the head with opercular apparatus must have 
considerably exceeded the maximum depth of the trunk, 
but it is very imperfect; the caudal region is also almost 
wanting. All the vertebral centra are somewhat longer 
than deep, and 28 pairs of stout ribs are exhibited. The 
long and delicate intermuscular bones are conspicuous as 
usual above the vertebral column. Of the fins, only a 
fragment of the pectoral pair remains. 
Egerton df Enniskillen Colls. 
P. 417 a. Imperfect remains of a fish about 035 in length; Pur- 
beck Beds, Swanage. The cranium is wanting from the 
head, while portions of the vertebral column are missing 
from the middle of the abdominal, and the front of the 
