324 
SELACHII. 
The caudal fin (c.) is also imperfect, but evidently large 
and powerful. Egerton Coll. 
P. 3194. Portion of a vertebral column, comprising about twenty- 
eight centra, with shagreen and a dorsal spine. 
Enniskillen Coll. 
P. 3195. Series of thirteen vertebrae. Enniskillen Coll. 
P. 1299. Series of about twenty-nine vertebrae. Egerton Coll. 
P. 3191. Anterior dorsal fin-spine, figured by Egerton, loc. cit. 
pi. vii. fig. 3, and said to pertain to another fossil in the 
Enniskillen Collection not now identifiable, unless it be 
No. P. 3194, inaccurately described, Enniskillen Coll. 
P. 1298. A larger remarkably straight dorsal spine. Egerton Coll. 
47463. A complete spine, unabraded, long and straight. 
Purchased , 1876. 
Palseospinax egertoni, sp. nov. 
1873. Palceospinax (P), Sir P. Egerton, Figs. & Descrips. Brit. Organic 
Remains (Mem. Geol. Surv.), dec. xiii. no. vii. p. 3. 
Type. Crushed head, teeth, and vertebrae; British Museum. 
The unique specimen mentioned below may be referred with 
much probability to the genus Palceospinax , and indicates a larger 
species than P. prisons , characterized by the relatively greater 
breadth of the median cone in the anterior teeth, and the smooth¬ 
ness of the shagreen-granules, of which the margins are sometimes 
so much indented as to give them a stellate appearance. 
Form. Sf Loc. Lower Lias : Wiirtemberg. 
P. 1132. A vertically crushed head and the anterior portion of the 
vertebral column, with shagreen, a few prehensile teeth, 
and a displaced cartilage, to be regarded either as the left 
mandibular or ceratohyal; Ohmden, Wiirtemberg. The 
head must have been originally at least 0-075 in length, 
and the snout is obtusely rounded. The anterior teeth 
are quite smooth, showing only the slightest traces of 
vertical wrinkles at the base, and the median cone is rela¬ 
tively broad, gradually tapering to a very sharp point; a 
single prominent broad lateral denticle occurs on each 
side. The shagreen-granules are largest towards the end 
of the snout, smooth, and more or less quadrate, but often 
deeply indented on two or more borders, thus assuming 
