96 MOLLUSCA FROM THE CRAG. 
The living animal has recently been obtained by Mr. M‘Andrew, from the depth 
of nearly 50 fathoms, on a muddy bottom, in the Sound of Skye; and it is quoted by 
Lovén as an existing species on the Coast of Finmark, while Moller gives it from the 
Greenland Seas. 
8. Lepa THraAci#rormis, Sforer. Tab. X, fig. 15. 
Nucuta Turacrmrormis. Stor. Bost. Journ. Nat. Hist., vol. ii, p. 122, 1838. 
— — Gould. Invert. Massach., p. 97. fig. 66, 1841. 
a Dekay. Nat. Hist. New York (Zoology), p. 178, pl. 12, fig. 217, 
a—, 1843. 
Spec. Char. ‘ Testa ovato-oblongd, transversd, nigra, crassa ; anticé rotundatd, postice 
truncatd et compressa, umbonibus prominentibus ; cardine foved magna.”  (Storer.) 
“Shell ovato-oblong, transverse, black, and thick; anterior side rounded, posterior 
truncated and compressed, beaks prominent, with a large ligamental pit.” 
The specimen figured, was obtained by R. M‘Andrew, Esq., a gentleman to 
whom science is so largely indebted for a more correct knowledge of our native 
Marine Fauna. This novelty is the result of one of his very recent explorations in 
the Sound of Skye, and was dredged, he tells me, at the depth of about 50 fathoms, 
and found in association with Leda truncata, Pecten Islandica, &c., species supposed to 
have become extinct in our own Seas, though still existing in some other regions of 
the Northern Hemisphere: the specimen (although but a fragment, is a considerable 
portion of the shell), was consigned to Professor E. Forbes, who is also of opinion 
that it is identical with Leda Thracieformis, and 1 am much indebted to those two 
gentlemen for the privilege of being the first to make it known as having once been an 
inhabitant of our own Seas; and although it be another, to which as a describer of 
the Crag species I may not strictly have a claim, it belongs at least to the bygone 
times, and comes into the province of the Paleeontologist. 
What remains of the specimen seems to justify its being considered as belonging 
to the species to which it is here assigned, although the most characteristic portion of 
the shell is destroyed; I have, therefore, copied the specific character from the 
original describer: it differs from Z. truncata in being somewhat thinner and more 
compressed, but there is scarcely enough of the shell remaining to show satisfactorily 
the peculiar ridge on the posterior side sloping from the umbo to the extremity of 
the ventral margin: it is ornamented with concentric striz, like JZ. truncata, and they 
are slightly wavy in their direction. 
The specimens of this species hitherto recorded as having been found in the recent 
state were from the stomachs of the Cod and Sand-dab, and these fishes were taken 
at the depth of 30 fathoms and upwards. 
The outline tracing is copied from the figure of the recent shell in Dr. Gould’s 
‘Invertebrata of Massachusets.’ 
