PYCXODOXTim®. 
243 
strongly ornamented, while the outer end of the larger teeth is 
raised into a pointed eminence. 
Form. Loc. iNeocomian (Speeton Clay): Yorkshire. 
P. 1624. Imperfect left splenial; Speeton. Egerton Coll. 
Gyrodus coccoderma, Egerton. 
(?)1867. Pycnodus subcontiguidens, H. E. Sauvage, Catal. Poiss. Form. 
Second. Boulonnais (Mem. Soc, Acad. Boulogne-sur-Mer, yoI. ii.), 
p. 36, pi. ii. figs. 10, 11. 
1869. Gyrodus coccoderma , Sir P. Egerton, Quart. Journ. Geol. Soc. 
vol. xxy. p. 383, figs. 3, 4. 
1880. Gyrodus coccoderma , B. Damon, Geol. Weymouth, ed. 2, Suppl. 
pi. xi. fig. 5. 
(P) 1880. Mesodon subcontiguidens , H. E. SauYage, Bull. Soc. Geol 
France, [3] vol. viii. p. 528. 
/37~s£s , 
Type. Yomer; Mu s eum - of Practical Goology^ London. 
A species of large or moderate size, known only by the dentition. 
Teeth closely arranged and all with a feeble ornamentation, rapidly 
obliterated by wearing. Yomer with a prominent median series of 
teeth, at least equalling the two flanking series in width ; the outer 
of the latter obtusely conical, not much elevated and exceeding in 
size the inner series of flanking teeth, which are round or antero- 
posteriorly elongated. Splenial differing from that of G. circulciris 
and G. cuvieri merely in the comparative smoothness of the teeth. 
Though the name G. coccoderma was originally proposed for some 
specifically indeterminable scales, it has gradually become applied 
to the dentition above described, and the vomer provisionally 
assigned to this species by Egerton may thus be regarded as the 
type specimen. 
Form, Loc. Kimmeridgian : Dorsetshire and Cambridgeshire; 
N. France. 
P. 6747. Fine large vomer 0028 in maximum width, with little- 
worn dentition ; Elmmeridge Clay, Weymouth. 
Purchased, 1892. 
P. 6167. Two somewhat smaller specimens, one figured by Damon, 
op. cit. pi. xi. fig. 5 ; Weymouth. Damon Coll. 
43560, 43562. Portion of similar vomer, and a smaller specimen; 
Weymouth. Purchased , 1872. 
40637, 41175, P. 3785 a. Three fine much-worn vomers; Wey¬ 
mouth. Purchased , 1867-68 and Enniskillen Coll. 
