a 
“wholly opaque, M 
ncated posteriorly, with : obtuse dg 
etatis Fom the beaks to the mele of 
truncation ; cardinal edge rathe rd 2 stron TES À 
spoon-shaped process on each pr ing from DN 
just behind the summits obliquely fo forwarc and inwardly, 
and receiving a strong internal ligament ; the cavity of 
this process is divided by a single tooth or ridge, i in the 
outer hollow formed by which, is inserted th external 
portion of the ligament. The valves, internally, are of 
a dead white, except outside of the impressions, where 
they are bright and polished. The anterior muscular im- 
pression is long, narrow, submarginal, and contracted near 
the middle; the posterior is rather large and rounded; 
palleal i impression deeply rounded out, posteriorly. 
Length two and a half, height one and three fourths, 
diameter one and a halfinches. — — 
Inhabits the English Channel, - em of dauid 
shores, and, according to M. Kiener, the Mediterranean. 
Ozservations. This shell was first briefly described 
by Mr. Pennant in his British Zoology, where he men- 
tions it as common among the Hebrides, by the gentry of 
"which islands its animal is eaten. The species, figured 
by Mr. Donovan as Mya declivis, probably under the 
idea that it was the same as Mr. Pennant’s, is distinct 
from it although given as a synonym by Maton and 
Rackett, in their notice of M. declivis. Penn., Linn. 
Trans, VIII p. 36, and by Montagu, in his Testacea Brit- 
tanica, E: 40. That Mya declivis, Penn. is identical 
with his M. pubéscens, Mr. Montagu, in his Supplement, 
amines ng. there ci be no question, remarking, “ the 
