173 
VENUS varicosa. 
TAB. CCOXCVI.—Figs. 1 and yas 
Sree. Cuar. Subglobose, with projecting beaks, 
transversely furrowed ; two longitudinal vari- 
cose ridges within each valve. 
ee 
Nor remarkable for any thing but the furrows that 
occur along the middle of the specimens, all of which 
are casts, in a light coloured limestone: the furrows 
are two upon each valve, one of them much larger than 
the other, and terminated before it reaches the edge by 
a deep hollow: corresponding ridges must have existed 
inside the shell, but whether they were visible externally 
cannot now be discovered : the concentric furrows that 
are strongly marked upon some specimens would seem 
to indicate a thin shell. It is nearly globose, but not 
so deep as long: the line of the hinge is two-thirds as 
long as the shell, and nearly straight ; other characters 
of the hinge are not discoverable. the beaks are much 
incurved, 
From Felmarsham, by favour of my good Friends 
Miss Ludlow, H. Goodhall, Esq. and the Rev. 
Thomas Oliver Marsh; the characteristic furrows are 
somewhat variable, the lesser being often very indistinct. 
Miss Benett has kindly sent me many specimens of a 
large Venus from the Portland Limestone, in some of 
which there are similar furrows ; they are less regular, 
shorter, and more lateral. As I hope to meet with the 
outside of this species, (I have fragments at present,) 
I postpone figuring it; in the mean time I may fairly 
expect to gain some further information respecting that 
