404 CRETACEOUS LAMELLIBRANCHIA. 



rounded forms (like Sowerby's siiutata) are older individuals of the same tj'pe, and 

 sometimes attain a height of 8 or 9 inches. 



A small, oval, very inequilateral form, with a rounded carina, was named Ed-ogyra 

 leengata by Sowerby (1829), and -was stated to have come from the Irish Green- 

 sand. An examination of the type shows clearly that it was not obtained from 

 that deposit, but from the Hythe Beds ; the form of the shell and the character of 

 the matrix agree perfectly with other examples which have been found in the 

 Hythe Beds (figs. 208, 209). 



The examples from the Lower Greensand of Upware, which were referred Ijy 

 W. Keeping to Exogyra Gouloni, probably belong to this species, but the specimens 

 seem to me too few and not sufficiently perfect to enable the identification to be 

 made with certainty. 



In England Sowerby's name {sinuata) has been generally used for this species, 

 but Defrance's name {Gouloni) has been adopted by foreign writers; the former is 

 used here since, although Defrance's name has priority, the description was 

 scarcely sufficient for identification and was not accompanied by either a figure 

 or a reference to a figure. 



Types. — Gryphsea Gouloni, Defrance, from the neighbourhood of Neuchatel. 

 G. dnuata, Sowerby, from the Hythe Beds of Ashford, and E. laevigata from the 

 Hythe Beds, in the British Museum. G. aquiln, Bi'ongniart, from the Upper Aptian 

 of the Perte du Rhone. G. sinuata, Phillips, from the Speeton Clay, in the York 

 Museum. Exogyra suhsinuata, Leymerie, from the Neocomian of the Aube. 



Distribution. — Atherfield Beds of Atherfield, Compton Bay and Sevenoaks. 

 Ferruginous Sands of Atherfield and Shanklin. Hythe Beds of Hythe, Lynipne 

 and Maidstone. Folkestone Beds of Folkestone. Mammillatas bed of Okeford 

 Fitzpaine (Dorset). Speeton Clay (zones of Belemnites lateralis, B. jaculmn and B. 

 b runs vice nsis) of Speeton. Claxby Ironstone (zone of B. lateralis) of Donnington. 

 Tealby Limestone (zone of B. brunsvicensis) of Claxby. 



Exogyra tuberculifeka, Koch and Dnnl-er, 1837. Plate LXI, figs. 7 — 11. 



1835. Exogyra aviUAi^ia, F. A. liiJmer. Versteiu. uord-deutsoli. Oolith.-geb. p. 65 



{partim), (non E. sinralis, Goldfuss). 

 1837. — TUBERCULIFEKA, F. C. L. Kock uiid W. Bunker. Nord-deutsch 



Oolith.-geb., p. 64, pi. vi, fig. 8. 

 ? 1839. — suiiPi.icATA, F. A. liiiiiicr. Versteiu. uord-deutsch. Oolith.-geb., 



Nuchtrag., p. 25, pi. xviii, fig. 17. 



1841. — — Mumer. Die Verstein. d. nord-deutsch. Kreidegeb., 



p. 47. 



TUBERCULIFEBA, lithiivr. Ibid., p. 48. 



1842. — SUDPLICATA, A. Leymerie. Mt'ni. Soc. geol. de Frauce, scr. 2, 



viil. V, p. 18, pi. xi. figs. 4 — 6. 



