34 EOCENE MOLLUSCA. 
23. Osrrea zonuLata, S. Wood. Tab. X, fig. 4, a—e. 
Spec. Char. O. testd elongato-ovatd, tenui, fragili, valvd sinistrd convead, profundd, 
mmbricatd ; imbricibus tenuibus, distantibus ; valvd deatrd pland, lamellatd ; cicatriculé 
musculari minima, reniformt ; ared cardinali angusta. 
Shell elongately ovate, thin, and fragile ; left or lower valve convex, deep ; upper valve 
flat and lamellated, lamellee or fimbriations thin and distant ; muscular impression small ; 
cardinal area narrow. 
Longest diameter, 1} inch, 
Locality. Qall Head, near Stubbington. (Fisher.) 
The above shell has been recently obtained by the Rev. Osmond Fisher, who has kindly 
permitted me to have it figured. 
It somewhat resembles O. velata in the regularity of the imbrications, but it differs in 
having these imbrications fewer in number, and they are broader, more thin, and delicate ; 
besides which, the upper valve in this species is quite free from the strize which form 
so marked a feature in the upper valve of O. velata. 
Fig. 4, Tab. VIII, represents a specimen of the upper valve of an oyster, from the 
cabinet of Mr. Edwards, and found at Bracklesham. ‘This was figured previous to the 
discovery of the above species, and it was then considered so closely to resemble. the French 
Eocene fossil, O. /amellaris, Desh. (Coq. foss. des Env. de Paris, pl. 54, figs. 3, 4), as to 
deserve a representation, from a possible identity ; but in the subsequent work by the same 
author (An. sans Vert. du Bassin de Paris, t. xi, p. 106), that shell is referred to O. 
multistriata, in which species the upper valve is represented as finely and closely striated. 
Our shell is quite free from strize of any kind, and it does not appear to have been decor- 
ticated. T am now therefore inclined to refer it to the present species. 

In the ‘ Quarterly Journ. of the Geol. Soc.,’ 1854, p. 117, Mr. Prestwich speaks of an 
oyster as having been met with at Kyson (0. Bel/ovacina 7); but the specimen cannot be 
found. Mr. J.C. Moore obtained an oyster in an estuary deposit in the New Forest. 
‘Journ. Geol. Soc.,’ vol. v, p. 316,1849. ‘This specimen also we have not been fortunate 
enough to find. 
