26 EOCENE MOLLUSCA. 



on the siphonal region, like the character generally given for Gryphaa, and on the tablet 

 of Dr. Bowerbank's specimen was written the name of Gryphaa ; I cannot see any- 

 thing to distinguish it generically from Ostrea, except the very small place of attachment, 

 which of itself is insufficient. 



12. Ostrea inflata? Deshayes. Tab. VII, fig. 4. 



Ostrea inflata. Desk. Coq. Foss. de Par., t. i, p. 359, pi. 58, figs. 4, 5, and pi. 59, 



figs. 1, 2, 1825. 



— — /. Sow., in Dixon's Geol. of Suss., p. 95, t. iv, fig. 7, 1850. 



— — Morris, Catal. Brit. Foss., p. 174, 1854. 



Spec. Char. "0. testa ovato-dcformi, profunda, yibbosd ; valvd inferiore rariplicatd ; 

 umbo7ie anyusto ; foss/dd liyamcnti anyusid, maryinibus super ne crenatis." 



Shell deformedly ovate, deep, inflated (?), lower valve with few radiating ridges, 

 umbones sharp, ligamental area narrow, superior margins crenulated. 



Lonyest Diameter, \\ inch. 



Localities. Bracklesham {Edwards). 



France, Valmondois {Deshayes). 



This is not at all a satisfactory species. I have only two or three specimens from 

 Mr. Edwards's cabinet that appear to correspond with the above diagnosis of M. Deshayes. 

 They are left valves, and have adhered, near the margin of the shell, to some cylindrical 

 body ; they are by no means " inflated," but shallow. The shell figured by M. Nyst, under 

 this name, appears to be very different from the British specimens. 



13. Ostrea longirostris, Lamarck. Tab. VI, fig. 4. 



Ostrea longirostris. Lam. An. du Mus., t. 14, pi. 21, fig. 9. 



— — Desk. Coq. Foss. de Par., t. i, p. 351, pi. 54, figs. 7, 8 ; pi. 60, 



figs. 1—3; pi. CI, figs. 8, 9; pi. 62, figs. 4, 5; and 

 pi. 63, fig. 1. 



— — /. Sow., in Dixon's Geol. of Sussex, p. 174, t. iv, fig. 4, 1850. 

 — Morris. Catal. Brit. Foss., p. 175, 1854. 



— — Desk. Hist, des An. sans Vert, du Bass, de Par., t. ii, p. 110, 1860. 



Spec. Char. O. testa diversiformi, ovato-rotundatd, vel elonyato-irreyulari ; foliaced, 

 ruyosd, incrassatd ; striis lamellosis fransversis instructd ; valvd inferiore prof undd ; umbonc 

 lonyissimo, canaliculato, irreyulariter conforto, acuto, triyono, tenue-striato vel sulcata ; 

 fossuld utroque latere maryinatd. 



Shell variable, ovately rounded, or elongately irregular, foliaceous, rough, and very thick ; 

 inferior valve deep, with a very elongated ligamental area strongly marked with transverse 

 striee or lines of growth. 



