the Family Osteodesmacea. 155 
this part of the coast, covering it with marine plants and 
fragments of shells, many of them thrown up from great 
depths, and never seen at.any other season. It was 
during an excursion thither at this time, that I procured 
a gigantic specimen of SoLemya boredlis, Totten, meas- 
uring four and a half by one and three-fourths inches, 
now in the Society’s collection. A single valve of Lu- 
cina rádula, Lam., not previously known to exist on. 
our shores, was found last spring attached to the root of 
Laminaria saccharina, among which, it may be men- 
tioned, are frequently found Curron fulmindtus and C. 
sagrinatus Nob., which I have nowhere else seen alive. 
The specimen of Thracia serving for the preceding 
description, was obtained in the early part of March 
last, with the living animal. It was buried about six 
inches below the surface, at low-water mark. An acci- 
dent deprived. me of an opportunity to examine the ani- 
mal, and repeated visits in search of another have been 
wholly unsuccessful. 
_ This shell was described some years since by Mr. T. 
k Conrad, of Philadelphia, in his American Marine 
Conchology, as Turacta declivis, under the supposition 
that it was identical with Mya declivis, Penn., and the 
synonyms given as follows :— 
Mya declivis; Penn., Brit. Zodl, vol. IV. p. 79, 
Ligula pubéscens, Mowr., Test. Brit. p. 40. . 
Mya convéxa, Nom Gen. Conch. p. 92, tab. 10. 
Shs 
_ Anatina rains, Lam., Anim. sans. Vert. ik V. . p. 464, 
(old edit.) . 
` Thracia corbuloides ? BLAINVILLE. Man. de Malae. 
P- 965, tab. 76, f. 7. 
