59 
MYTILUS affinis. 
TAB. DXXXII.—fig. 1. 
Spec. Cuar. Obliquely oblong, carinated, smooth ; 
sides parallel, straight; the posterior arched in 
the young shell ; hinge without teeth, its an- 
terior margin reflected. 
Very similar in shape and proportion to the common 
Mussel, or rather M. pellucidus, but more decidedly 
carinated ; the extremity of the hinge within the beaks 
is reflected, and has no appearance of teeth; the poste- 
rior surface is not quite flat, but is convex near the 
beaks, a little approaching the genus Modiola. It dif- 
fers in the same way from M. Antiquorum (tab. 275.), as 
it does from M. pellucidus ;—it is remarkably pearly. 
Found in Colville Bay, Isle of Wight, by Professor 
Sedgwick, along with Mya angustata, Potamides ventri- 
cosus, &c. in Sand and Sandy Clay. , 
