t 23 ;! 
The fliell here figured was found in'a lindfe- 
ftone quarry at Camertonj about fix miles and 
a half from Bath on the road to Wells: thofe 
found in lime-ftone quarries on the uppef 
Briftol road near Bath, are fmaller; their 
Ihell thin; white; a triangular hole between 
the beak of the lower valve, and the hinge: and 
have the body. 
Fig. 33. A. B. within them; it confifts of two 
hollow cones joined to each other by part of 
their bafe and to one of the valves, but not 
fo clofe as to prevent the animal, or part of it 
from retreating into them : the furface of them 
are beautifully covered with circular rows of 
fmall pyramids of fpar. 
F I G. - 
Shells two inches broad, and near two in¬ 
ches long : ftriated from the beaks to the 
edges: a high wave in the middle of the 
margin : beak of the lower valve does not curve 
over the upper, but is divided from it by a 
ftrait broad furrow: hinge ftrait. 
I have given no figure of this ftiell, as I am 
not certain it was found near BatHo 
It 
