The Complete Writings of Thomas Say, On the Conchology of the United States
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sans Vert., &c. Desc. Shell oblong, subovate, very narrow behind and widely rounded before ; 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 Prout's 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 round* d anteriorly than posteriorly, and the dorsal angle is much more prominent. Leach quotes MytUlus modiolus, Linn., as a synonym of M.
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