268 
SELACHII. 
P. 3165. Very long slender spine, wanting posterior denticles, 0-435 
in total length. 
37387. Small spine, exserted 0*14. 
46564. Small spine, 0-143 in total length. 
P. 2167. Small slender spine, exserted 0*105. 
P. 2805. Small slender spine, exserted 0*17. 
P. 2825, P. 2829. Two small spines, exserted 0-08 and 0-09 respec¬ 
tively. Enniskillen Coll. 
Enniskillen Coll. 
Purchased , 1863. 
Purchased , 1875. 
Egerton Coll. 
Enniskillen Coll. 
P. 2817. Much abraded posterior spine, exserted 0-2. 
EnnisJcillen Coll. 
An undetermined species allied to Hybodus reticulatus is indicated 
by a large slab from the Lias of Boll, Wiirtemberg (P. 5880), ex¬ 
hibiting remains of the cartilages of the mandibular, hyoid, and 
branchial arches, with a few imperfect teeth and one dorsal tin- 
spine. 
Hybodus polyprion ? Agassiz. 
1843. Hybodus polyprion, L. Agassiz, Poiss. Foss. vol. iii. p. 185, 
pi. xxiii. tigs. 1-15 x . 
1871. Hybodus poly prion, J. Phillips, Geol. Oxford, p 177, diagr. 
xxxvii. figs. 2, 3. 
1871. Hybodus juyosus, J. Phillips, op. cit. p. 177, diagr. xxxvii. fig. 1. 
1886. Hybodus poly prion, A. S. Woodward, Geol. Mag. [3] vol. iii. 
p. 257, pi. vi. tigs. 1, 2. 
Type. Detached teeth; School of Mines, Paris. 
Teeth with a high much compressed crown ; median cone ob¬ 
lique, except in the most anterior teeth ; lateral cones two or three 
in number, broad. Coronal surface of the anterior and principal 
teeth smooth, except near the base, where marked by short vertical 
wrinkles; a few of the superficial wrinkles in the posterior teeth 
extending to the apices of the cones. Boot short, depressed. 
As already remarked by Agassiz and the present writer, some of 
the teeth of this species exhibit considerable resemblance to those 
of Notidanus. 
Form. Sf Loc. Bathonian (Stonesfielcl Slate): Oxfordshire and 
(?) Somersetshire 1 2 . 
1 It is not unlikely that some of these are small teeth of H. grossiconns. 
2 Quenstedt (Der Jura, f858, p. 348, pi. 47. figs. 29, 30) refers some teeth to 
this species from the Continental “ Brauner Jura /3”; the determination is, 
however, very doubtful. The same may be said of the tooth from the Corallian 
