78 CRETACEOUS LAMETJJRRAXCHIA. 



and Roux, the species now iiiuler consideration must be known as Gervillia suh- 

 lanceolata (d'Orbigny). 



The yonng individuals of G. snblanceolata differ from the adults in that the 

 anterior part of the shell is relatively longer and more wing-like, the posterior ear 

 is more sharply limited and its growth-lines are concave posteriorly, and tlio valves 

 are more unequal (Plate X, figs. 14, 15). 



G. anhlaiiceoJafa belongs to Freeh's ' Group of G. aviciiloides.' Freeh gives a 

 figure of the hinge and interioi' of a specimen from Atherfield. 



I am greatly indebted to Professor Douvillc for the opportunity of seeing a 

 specimen of Gervillia anceps from Aube, and also for his kindness in comparing (/. 

 snhlanccolata with the specimens of G. anceps in the Ecole des Minos, Paris. 



Ti/pes. — One of the specimens figured by Sowerby (fig. 5) is in the British 

 Museum ; the others (figs. 1 — 3) cannot be traced. Sowerby's fig. 4 is from the 

 Corallian of Shotover, and does not belong to this species. Avicuhi lanceolata, 

 Forbes, from the Lower Greensand (pr()bnl)ly Crackers) of Athei'tield, is in tlie 

 Museum of the Geological Society (No. 2057). The type of llerrillia dlpinn came 

 from the Gaidt of Saxonet. 



Disfrihiifion. — Lower Greensand (('rackers and Fitton's Beds 20 and 15) of 

 Atherfield. Atherfield Beds of Sevenoaks. 



Recorded by To]dey from the Atherfield Beds of Haslemere, Peasmarsh, Shal- 

 ford, and Redliill ; fi'om the Hythe Beds of Hythe, Lympne, Maidstone, and 

 Pull)orough ; and from the Sandgate Beds of Sandgate, Folkestone, and Parliajn. 



Upper Greensand (zone of Srhhvnhncli'oi roi<fr<if(i) of the Tsle of Wight, Black- 

 down, and llaldon. 



Gervillia i.tnoulotdes, Forbes, 1845. Plate XI, figs. 2-8. 



1845. Gkrvillia lingtjloides, E. Forbes. Quart. Joiirn. Geol. Soc, vol. i, p. 246, 



pi. iii, fig. 9. 



— AvicuLA EPHEMERA, Forhcs. Ibid., p. 247, pi. iii, fig. 6. 



184G. Gervillia linouloides, A. d'Orhigny. Pal. Fraii9. Terr. Crct., vol. iii, p. 



485, pi. cccxcvi, figs. 1 — 4. 

 1850. — — d'Orbigny. Prodr. de Pal., vol. ii, p. 119. 



AviC0LA EPHEMERA, — Ibid., p. 119. 



1854. Gervillia linouloides, J. Morris. Cat. Brit. Foss., ed. 2, p. 107. 



— AvicuLA ephemera, Morris. Ibid., p. 163. 



1858. Gervillia linouloides, F. J. Pidet and E. Renevier. Foss. Terr. Ajitien 



(Mater. Pal. Suisse, ser. 1), 

 p. 123, pi. xviii, figs. 3, 4. 



1869. — — F.J.Pictetand G.Campiche. Foss. Tern Cret. Ste. 



Croix (Mater. Pal. Suisse, 

 ser. 5), p. 91. 



