254 
SELACHII. 
Hybodus apicalis, Agassiz. 
1843. Hybodus apicalis , L. Agassiz, Poiss. Foss. vol. iii. p. 195, pi. xxiii. 
figs. 16-20. 
Type. Detached teeth. 
Teeth very minute, with a high crown, the principal cone tapering 
to a very sharp point. 
Form. Log. Lettenkohl: Hanover. 
P. 2190. Three broken teeth; Hildesheim. Egerton Coll. 
Hybodus minor, Agassiz. 
1837. Hybodus minor , L. Agassiz, Poiss. Foss. vol. iii. p. 48, pi. viii. b. 
figs. 2, 3 (spine). 
1843. Hybodus minor , L. Agassiz, tom. cit. p. 183, pi. xxiii. figs. 21-24 
(teeth). 
1844. Hybodus minor, H. von Meyer & T. Plieninger, Beitr. Pal. Wiirt- 
tembergs, p. 109, pi. xii. fig. 28. 
1872. Hybodus minor , R. Etheridge, Proc. Cardiff Naturalists’ Soc. 
vol. iii. pi. ii. figs. 12-14. 
Type. Dorsal fin-spine; Bristol Museum. Teeth; British 
Museum. 
A relatively small species. Teeth with a high crown, much 
resembling H. apicalis, but having the principal cone more slender 
and less sharply pointed. Lateral denticles 1-3, robust, and the 
coronal superficial wrinkles prominent. Base depressed, flattened, 
expanded posteriorly. 
Upon the dorsal fin-spines, referred by Agassiz to the same 
species, the longitudinal ridges are rounded, strong, and of approxi¬ 
mately equal size; the posterior face is slightly convex, and the 
denticles large. Some of these spines, however, must pertain to 
Acrodus minimus. 
Form. Sf Log. Bhaetic : Somersetshire, Gloucestershire, Devonshire, 
Leicestershire, and Wurtemberg. 
P. 2783-4. Teeth described and figured by Agassiz, tom. cit. p. 183, 
pi. xxiii. figs. 23, 24; Axmouth, Devonshire. 
Enniskillen Coll. 
P. 2786, P. 2789. Fourteen detached teeth; Axmouth. 
Enniskillen Coll. 
P. 2771. One tooth labelled H. plicatilis by Agassiz; Axmouth. 
Enniskillen Coll. 
Egerton Coll. 
P. 2194. Two detached teeth; Axmouth. 
