246 
ACTINOPTEEIGII. 
Clay, Weymouth. The teeth of the median and inner 
lateral series only are preserved, and each is slightly 
broader than long, with a cingulum at the base of the 
crown which is raised into a comparatively trenchant edge. 
Purchased , 1871. 
The following species have also been imperfectly defined, chiefly 
upon the evidence of the dentition, but are not represented in the 
Collection :— 
Gyrodus contiguidens' : Py modus ( Typodus ) contiguidens , F. J. 
Pictet, Rept. et Poiss. Foss. Jura Heuchatel (1860), p. 69, 
pi. xvi. fig. 1; (?) J. Cornuel, Bull. Soc. Geol. France, [3] 
vol. xi. (1883), p. 23, pi. i. figs. 4, 5.—Kimmeridgian; 
Heuchatel. (?) Heocomian; Haute Marne. [Yomer; 
Heuchatel Museum.] 
Gyrodus fabrei , H. E. Sauvage, Bull. Soc. Geol. France, [3] 
vol. vi. (1878), p. 629, pi. xi. fig. 2.—Lias; Haney, 
France. [Left splenial.] 
Gyrodus fortisi , G. G. Gemmellaro, Studi Paleont. Fauna Calc. 
Terebratida janitor H. Sicilia, pt. i. (1868), p. 6, pi. ii. 
figs. 15-31.—Tithonian ; Favara, Yillabate, H. Sicily. 
[Detached teeth ; Geological Museum, University of 
Palermo.] 
Gyrodus goiueri , Sir P. Egerton, Quart. Journ. Geol. Soc. vol. xxv. 
(1869), p. 379, figs. 1, 2.—Middle Jurassic; Culgower, 
Sutherland. [Trunk.] 
Gyrodus imitator : Pycnodus imitator , J. Cornuel, Bull. Soc. Geol. 
France, [3] vol. v. (1877), p. 612, pi. xi. fig. 11, and ibid. 
vol. viii. (1880), p. 157, pi. iii. figs. 18, 19. Cosmodus 
imitator , H. E. Sauvage, Bull. Soc. Sci. Hat. Yonne, 
vol. xxxiii. (1879), pt. ii. p. 49.—Heocomian ; Wassy, 
Haute Marne, and Yille-sur-Saulx, Meuse, France. [Im¬ 
perfect splenial.] 
Gyrodus (?) Icevior , L. Agassiz, Poiss. Foss. vol. ii. pt. ii. (1844), 
p. 233, pi. lxix. a. fig. 12.—Form. & loc. unknown Y 
[Bight splenial; Paris Museum Hat. Hist.] 
Gyrodus larteti : Pycnodus larteti , H. E. Sauvage, Catal. Poiss. 
Form. Second. Boulonnais (Mem. Soc. Acad. Boulogne- 
sur-Mer, vol. ii. 1867), p. 33, pi. ii. fig. 1, and Bull. Soc. 
Geol. France, [3] vol. viii. (1880), p. 527.—Portlandian ; 
H. France. [Imperfect splenials ; Boulogne Museum.] 
1 An isolated tooth in the Enniskillen Collection (P. 3783), said to have 
been obtained from the London Clay of Sheppey, is labelled “ Gyrodus Icevior , 
Agass.” by Agassiz. 
