173 
VENUS varicosa. 
TAB. CCXCVI .—Figs. 1 and 2. 
Si* ec. Char. Subglobose, with projecting beaks, 
transversely furrowed ; two longitudinal vari- 
cose ridges within each valve. 
Not 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 
