CESTEACIOirnD^. 
301 
P. 2167. Eleven small spines, mostly with large posterior denticles, 
some approaching “ U. crassisjnnus,” some much larger. 
Eyerton CoU, 
P. 2828. Type specimen of 11. crassispinus described by Agassiz, 
Poiss. Foss. vol. iii. (1837), p. 48, pi. viii. b. fig. 7. 
Enniskillen Coll, 
P. 2815, P. 2823, P. 2829, P. 4427-9. Twenty small spines, some 
like “ H. crassispinus” some more slender and more finely 
ribbed, others much larger. Enniskillen Coll, 
(h) Cephalic Epines. 
36164. Jfearly complete spine with small protuberances at the base 
of the exserted portion, the so-called Ephenonchus liamatus, 
Agass. ' Purchased, 18C1. 
41350. Three e.xamples. Purchased, 1869. 
38538. Exserted portion of a similar spine. Purchased, 1864. 
P. 2204. Three more or less complete examples, one with broad 
rounded base, the othere with the base more compre.ssed ; 
one is labelled in Agassiz’s haiidwiiting, E^dieiwtulius 
hamatus, Ag.” Eyerton CoU. 
P. 2772. Seven specimens, five nearly perfect, showing a single 
barb. Enniskillen Coll. 
P. 4630. Two spines, associated with cartilage and shagreen. 
Enniskillen Coll, 
IV. Lower Oolite. (a) Dorsal Fin-spines. 
47144. Type specimen of Hybodus crassus, Agassiz, described and 
figured, tarn. cit. p. 47, pi. x. fig. 23, said to have been 
obtained from the Inferior Oolite of Eraunston, Oakham ; 
the locality cannot be accurate, and is given by Agassiz as 
llodmore Pits, near Towcester. Eharji Coll. 
47439. A small finely-ribbed compressed spine, the exserted portion 
measuring about 0'09 in length, and its base-line very 
oblique ; posterior denticles small, though mostly de- 
stroyed ; Inferior Oolite, Stamford, Lincolnshire. 
Sharp Coll. 
P. 2153. Extremity of a spine resembling that named Hyhodus apn- 
adis, Agassiz’; Stonesfield Slate, Stonesfield. Erjerlon CoU. 
' L. Agas.siz, Poiss. Foss. vol. iii. (1843) p. 2U2, pi. xxii. a. figs. 12-14. 
^ Poiss. Foss. vol. iii. (1837), p. 43, pi. i. fig. 22. This is not H. apicalis, 
Agats., tom. cit. p. 195, pb xxiii. figs. 16-20. 
