20 EOCENE MOLLUSCA. 
Diameter, 1% inch. 
Locality. Stubbington (Edwards). 
In the beautiful work above referred to, now in course of publication by M. Deshayes, 
the author gives not less than three varieties of this species, and the British fossil does not 
differ in essential characters from one of the varieties of what is considered by the French 
author to be a very variable shell. I have, however, placed the British fossil under that 
name with a mark of doubt. 
6. Osrrea cymBuLoipEs, S. Wood. Tab. ILI, fig. 2, a, 4. 
Spec. Char. O. testa ovato-oblongd, depressiusculd, valvd inferiore radiatim plicatd, plicis 
rolundis, tuberculato-squamosis, subundulatis, bifidis ; valvd superiore pland ; marginibus 
superne crenalts. 
Shell ovately oblong, slightly depressed ; inferior valve radiately plicated, with rounded, 
rough, or tuberculated and bifurcated rays; margin crenulated all round in the lower 
valve, with lateral crenations on the upper part of the flat valve. 
Longest Diameter, 13 inch. 
Locality. Herne Bay (Bowerbank). 
Although this shell bears considerable resemblance to some of the forms of eymdula, 
it cannot satisfactorily be referred to that species, being more regularly ovate in outline, and 
more finely costated. It differs from f/adel/u/a in several characters, and it does not appear 
to have the tendency to angularity or prolongation which that species exhibits ; it has also 
more numerous rays. 0. divaricata, Lea, somewhat resembles this species, but that shell is 
more inflated on what, in the Dimyaria, would be the siphonal region, and there is also, 
apparently, a difference in the form of the muscle-mark ; this in our shell is large, reniform, 
and somewhat pointed upwards, while in the American fossil it is semi-lunate. 
The British fossil appears to be rare. 
7. Ostrea vorsata, Deshayes. ‘Tab. VI, fig. 2. 
Ostrea porsaTa. Desh. Coq. Foss. des Env. de Par., vol. i, p. 355, No. 22, pl. 55, 
figs. 9—11; and pl. 64, figs. 1—4, var. 8; pi. 54, figs. 9, 10. 
— — Id. 2d edit., Lam., t. vii, p. 251, No. 42, 1836. 
— ae J. Sowerby. Min. Conch., t. 489, fig. 2. 
— — Td., in Dixon, Geol. of Sussex, p. 174, 1850. 
— — D Orbigny. Prod. de Paleont., t. 11, p. 395, No. 1139, 1850. 
— — Morris. Catal. Brit. Foss., p. 174, 1854. 
— = Desh. An. sans Vert. du Bassin de Par., t. 11, p. 102, 1860. 
Spec. Char. O. testa orbiculatd, utrinque gibbosd ; in medio plus minusve subangulatd, 
vel semicylindraced ; valvd inferiore converd, extus irregulariter lamelloséd; valvd 
superiore striata ; striis tenuibus, divaricatis, instructd ; marginibus superne crenulatis. 
