256 
SELACHII. 
P. 2839. Imperfect large dorsal spine. Enniskillen Coll. 
34992-3. Two fragments of spines. Purchased , 1860. 
Hybodus cloacinus, Quenstedt. 
1858. Hybodus cloacinus, F. A. Quenstedt, Tier Jura, p. 34, pi. ii. fig. 15. 
1872. Hybodus reticulatus , R. Etheridge, Proc. Cardiff Naturalists’ Soc. 
vol. iii. pi. ii. fig. 11. 
(?) 1881. Hybodus austiensis, J. W. Davis, Quart. Journ. Geol. Soc. 
vol. xxxvii. p. 416, pi. xxii. fig. 1. 
Type. Detached tooth; Tubingen Museum. 
Teeth narrow and much laterally elongated : the principal coronal 
eminence slender and bluntly pointed, its height not equalling half 
the length of the tooth; lateral cones short, blunt, 3-4 on each side; 
superficial coronal wrinkles large, generally few and widely spaced, 
but variable. Root not expanded posteriorly. 
Form. § Loc. Rhsetic : Wurtemberg,jSomersetshire, Gloucester¬ 
shire, and Devonshire. (?) Lower Lias : Lyme Regis, Dorsetshire. 
23153 a. Three fragments of teeth; Aust Cliff, near Bristol. 
Purchased , 1849. 
P. 2193. Five teeth; Aust Cliff. Egerton Coll. 
P. 2776-7. Two imperfect teeth; Aust Cliff. Enniskillen Coll. 
P. 5100. Tooth; Garden Cliff, Westbury-on-Severn. 
Presented by J. E. Lee, Esq., 1885. 
P. 2771. Small tooth; Axmouth, Devonshire. Enniskillen Coll . 
The following dorsal fin-spines are of the form described by J. W. 
Davis (Joe. cit .) as H. austiensis, and, on account of their size, may be 
provisionally assigned to H. cloacinus. The lower portion of the 
posterior face appears to exhibit a more prominent longitudinal 
eminence than in the spines assigned to H. minor. 
36165. Abraded middle portion of spine; Aust Cliff. Johnson Coll, 
P. 2177. Two imperfect abraded spines ; Aust Cliff. Egerton Coll, 
P. 2778. A slightly crushed spine, wanting the extremity of the 
base ; Aust Cliff. The exserted portion measures about 
0*185 in length, and exhibits large posterior denticles 
much abraded, as in the specimen figured by Davis, loc. 
cit. Enniskillen Coll . 
P.2779. Incomplete exserted portion of a slightly larger spine; 
Aust Cliff. Enniskillen Coll. 
