256 
SELACnil. 
P. 2839. Imperfect large dorsal spine. EnnisMllen Coll. 
34992-3. Two fragments of spines. Purchased, 1860. 
Hybodus cloacinus, Qucnstcdt. 
1858. Hybodus doacinus, F. A. Quenstedt, Tier Jura, p. 34, pi. ii. fig. 15. 
1872. Hybodus reticulahis, R. Etheridge, Proc. Cardiff Naturalists’ Soc. 
vol. iii. pi. ii. fig. 11. 
(?)1881. Hybodus austtensus, 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. Rhoetic : Wiirtemberg, Somersetshire, Gloucester- 
shire, and Devonshire. (?) Lower Lias ; Lyme Regis, Dorsetshire. 
23153 a. Three fragments of teeth; Aust Clifif, near Bristol. 
Purchased, 1849. 
P. 2193. Five teeth; Aust Clifif. Egerton Coll. 
P.2776-7. Two imperfect teeth ; Aust Clifif. EnnisTcillen Coll. 
P. 5100. Tooth; Garden Cliff, Westburj'-on-Severn. 
Presented by J. E. Lee, Esq., 1885. 
P. 2771. Small tooth; Axmouth, Devonshire. Ennishillen Coll. 
The following dorsal fin-spines are of the form described by J. W. 
Davis (loc. cit.) as //. austiensis, and, on account of their size, may be 
provisionally assigned to II. cloarunis. The lower portion of the 
posterior face appears to exhibit a more prominent longitudinal 
eminence than in the spines assigned to II. minor. 
36165. Abraded middle portion of spine ; Aust Clifif. Johnson Coll. 
P. 2177. Two imperfect abraded spines ; Aust Clifif. Egerton Coll, 
P. 2778. A slightly crushed spine, wanting the extremity of the 
base ; Aust Clifif. The exserted portion measures about 
0’185 in length, and exhibits large posterior denticles 
much abraded, as in the specimen figured by Davis, loc. 
<^il. EnnisJi illen Coll. 
P. 2779. Incomplete exserted portion of a slightly larger spine; 
Aust Clifif. Eiinislcillen Coll. 
