C 13 I 
F I G, XIV. 
Round: beaks fmall, hooked, their points 
curving outward. Free Stone, 
; Found in many places near Bath* 
F I G. XV. 
Triangular: beaks fmall, hooked, their points 
TQUch curved outward. Free Stone, 
Found with Fig. 14. 
OBSERVATION. 
So far as I have ohferved Jhells are never filed with 
Jlone different from that in which they are lodged, 
• ' ^ M Y A. 
, A bivalve JJiell gaping at one end, 
F I 'G. XVI. 
Oval: marked with concentric Jlrice : beaks 
not in the middle, IJiOTt, hooked. The fliell is 
deftroyetl 
i 
