276 
8ELACHII. 
Hybodus sp. inc. (? striatulus, Agassiz). 
Teeth with a very high, much comprosscd crown ; median cone 
moderately broad ; lateral cones one, two, or three in number, the 
inner pair very long, slender, and pointed. Coronal surface marked 
with numerous delicate vertical wrinkles, rarely extending more 
than half the height of the median cone, but often reaching the 
apices of the lateral cones. 
Those teeth are most probabl)’ referable to the species indicated 
by the dorsal fin-spines named Ilyhodm striatulus, Agassiz ' ; but 
there is yet no evidence of association, and other spines occur in 
the same beds. A very similar tooth from the Wealden of Hanover 
is named If. pohjimon hy C. fttruckraann, Wealden- JSild. Umgegend 
Hannover ( 1880 ), p. . 58 , pi. iii. fig. 0 . 
Form. 4- Loe. Wealden : Tilgato Forest, Sussex. 
2685, 2693, 2692, 2697, 3027, 3029, 3032, 3136, 3139 41, 3144, 
3147-8. Sixteen teeth, some very fragmentary, one shown 
of the natural size in I’l. XI. fig. 15. Mantell Coll. 
26024, 26026, 26038. Three teeth and two fragments, one shown 
of the natural size in PI. XI. fig. 14 . Dixon Coll. 
P. 1276, P. 5823. The abraded principal cones of two similar teeth, 
figured among the type specimens of Merktodon paradoxus 
by L. Agassiz, tom. cit. pi. xxxvi. figs. 53, 54. 
Eyerton 4 Ennislcillen Colls. 
28410, 28420. Xino more or loss perfect teeth. Mantell Coll. 
48377. Median cone of a very largo smooth tooth. Purchased, 1877. 
P. 2844. Two teeth and two imperfect associated teeth. 
EimisJcilJen Coll. 
Three fragments, possibly of similar teeth, have also been obtained 
from the Lower Greensand of Godaiming, Surre}'. 
(P. 5520. Caleb Evans Coll.) 
Hybodus sp. inc. 
Teeth with a relatively low crown ; lateral denticles broad, two 
or three in number ; coronal surface marked by few widely spaced 
wrinkles, many extending to the apices. 
Form. 4 Loc. Wealden: Sussex. Neocomian ; Isle of Wight. 
28420 a. Specimen figured of the natural size in PI. XI. fig. 16 ; 
Tilgate Forest. Mantell Coll. 
' L. Agassiz, tom. cit. p. 44, pi. viii, b. flg. 1. 
