199 
Modiola PAPUAN a. — Specific character. Shell oblong, epi- 
dermis reddish-brown, shell violaceous. 
3Iusculus pa^uanuSy D’Argenv. Conch. (^Lam.) 
Modiola papuana, Lam. An. sans Vert., &c. 
Desc. Shell oblong, subovate, very narrow behind and widely 
rounded before 3 umbonial slope obtusely rounded and prominent ; 
surface rather deeply wrinkled ; epidermis reddish-brown, beneath 
which the surface of the shell is more or less violaceous ; within 
dull whitish, somewhat iridescent. 
I received several fine specimens of this shell from Dr. D. H. 
Storer as inhabiting Cape Elizabeth and ProuCs Neck, Maine. It 
is the common Horse muscle ” of the English collectors and ap- 
pears to be abundant in the European Ocean and Mediterranean 
Sea. Leach says, beneath the epidermis the shell is invariably 
whitish,’^ whilst * Lamarck says, Epiderme noiratre ; test lilas.’^ 
The shell appears to become more elongated with age. 
Adanson’s figure (pi. 15, fig. 1,) generally quoted for this species, 
is probably altogether distinct ; it is but little more widely rounded 
anteriorly than posteriorly, and the dorsal angle is much more 
prominent. Leach quotes Mytillus modiolus, Linn., as a synonym 
of 3f. papuana ; but Lamarck and some other conchologists quote 
it with doubt as the same as Modiola tulipa, Lam. 
Laskey, in the Transact, of the Wern. Soc., says they attain to 
the length of nine inches ', the largest in my collection is five 
inches and three-fourths long. PI. 45. 
Melania virginica. Var. a. Shell destitute of the rufous 
bands. PI. 47, f. 2. 
Buccinum rirginicum, Gmel. p. 3205, Dillw. Descr. Catal. 
p. 652. 
Lister, Synop. pi. 113, 7. 
Paludina virginica, noh. Nicholson’s Encycl. (3c? Am. Ed.') 
art. Conch.pl. ^,fig. 4. 
Melania fasciata, Menlte, Synop. Mollusc, p. 82. [Yar. a.~\ 
Lister, Synop, pi. 110, fig. 4. 
Melania multiline ata, nob. Journ. Acad. Nat. Sci., vol. 
b,p. 380. 
Melania curta, Menhe, Synop. AIollusc. y?. 81. 
It is closely related to M. virginica, nob., but may be distin- 
guished by its strise. PI. 47, fig. 3. 
