KOCENE MOLLUSCA. 
bo 
lon) 
This fossil has been hitherto assigned to O. radiosa, Desh., and I fee] reluctant to alter 
the name; but the large denticulations which are found invariably, in a greater or less 
degree, on the inner margin of the upper valve in well-preserved specimens, appear to offer 
a good specific character in contradistinction to the French shell of that name. 
15. Osrrea mutticostata? Deshayes. Tab. VI, fig. 3, a, 4. 
OsTREA MULTICOSTATA. Desh. Coq. Foss. des Env. de Par., p. 363, pl. 57, fig. 3—6. 
— — Broun. Leth. Geogn., b. iii, p. 352, t. 362, fig. 6, a, e. 
— —_— ? D’Arehiac. Anim. Foss. numm. de V'Inde, p. 273, pl. 24, 1854. 
Spec. Char. O. testd ovato-clongatd, subrectd, superne acutd ; valvd inferiore costatd, 
costis divergentibus ; valvd superiore planulatd, lamellis tenuibus, concentricis, ornatd ,; 
impressione muscular: obliqua. 
Shell ovately elongate, somewhat straight, with an acute umbo; lower valve covered 
with diverging ribs which bifurcate on the outer or older portion of the shell; upper 
valve flat, with small or fine concentric laminie or lines of growth ; muscular impression 
oblique. 
Height, 3 inches. 
Locality. Bracklesham (Zdwards). 
France, Retheuil (Desv.). 
A specimen in Mr. Edwards’ collection corresponds with the figure and description by 
M. Deshayes above referred to, and I have therefore regarded it as an identity, although it 
is possible it may only be an enlarged growth of one of the Bracklesham varieties of fabellula. 
'This is said to be abundant in France, where I presume there are better means of deter- 
mining the species. ‘lhe umbo in our shell is sharp and pointed, and the place of 
attachment is very small. ‘The upper valve is plain, or without the least appearance of 
vadiating strie. ‘The muscle-mark is of a somewhat transversely ovate form, excentric, 
and appears rather smaller, comparatively, than the one represented by M. Deshayes ; the 
ribs in our shell are smoother or less scaly; these trifling differences would probably 
disappear in a large series. 
16. Osrrea Picra, J. Sowerby. ‘Tab. VI, fig. 2. 
of 
Ostrea victa. J. Sow., in Dixon’s Geol. of Suss., pp. 25, 173, t. iv, fig. 1, 1850. 
— — Morris. Catal. Brit. Foss., p. 175, 1804. 
Spec. Char. O. testa crassa, orbiculari, intus purpureo-nigricante, lamellis via distinctis ; 
ae . a a . a A -%>. a . . 
valvd inferiore profundd, valvd superiore planatd ; ared cardinali lata ; impressione musculara 
magni, suborbiculari. 
