Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . c, (new series) vol. iv. p. 70, pi. iv., A. N. S., No. OBSERVATIONS. Say remarks of this species, that it resembles thep/icatus, nob., but on comparison it will be observedto differ essentially from that common species. Itis, however, more nearly related to the costatus ofRafinesque, with which Say at one time confoundedit, although he had previously published it under thename of heros. In his synonomy of the westernspecies of Unio and Alasmodonta, he very properlyreclaims t
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . c, (new series) vol. iv. p. 70, pi. iv., A. N. S., No. OBSERVATIONS. Say remarks of this species, that it resembles thep/icatus, nob., but on comparison it will be observedto differ essentially from that common species. Itis, however, more nearly related to the costatus ofRafinesque, with which Say at one time confoundedit, although he had previously published it under thename of heros. In his synonomy of the westernspecies of Unio and Alasmodonta, he very properlyreclaims the species. It may readily be distinguishedfrom the costatus by the small letter-shaped undula-tions on the umbo, darker epidermis, and by otherless obvious characters. Say informs us that it in-habits the Wabash river and tributaries. I am in-debted to Mrs. Say for the use of the beautiful andvery accurate plate, originally published in theAmerican Conchology. Deshayes considers this species identical with theundulatus of Barnes, and refers it to U. peruviana,Lam.* * Anim. sans Vert., vol. vi. p. 533. 60.
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
