124 
OVULA Leathesi. 
TAB. CCCCLXXVII1. 
Spec. Char. Elliptical^ elongated,, rather ventri- 
cose in the middle, smooth ; a large plait upon 
the columella. 
Nearly twice as long as wide, rather contracted to- 
wards the extremities, but hardly to be called beaked : 
the lip is smooth, very thick, and rather flattened ; the 
body of the shell has a slight concavity opposed to the 
lower part of the lip, and near its upper extremity it 
has a thick curved plait. There is a slight indication of 
a ridge across the back, which may have been reduced by 
wear. 
This Ovula appears to hold an intermediate place be- 
tween O. passerinalis (a fossil species from the Plaicen- 
tine, Lam. Hist . Nat . vii. 371.) and the O. Spelta, ap- 
proaching nearest to the former, which is however de- 
scribed as much more ventricose. The specimen figured 
is from the rich cabinet of Crag fossils in the possession 
of the Rev. G. R. Leathes, who obtained it at Walton : 
it is so rare that only a fragment besides has been found. 
So well known are the researches of the liberal pos- 
sessor of this curious shell, that no apology appears 
necessary for commemorating his name. 
