84 



LAND AND FRESH- WATER SHELLS OF N. A. [PAKT IH. 



Amuicola limosa, Sat. — Shell conic, suLumbilicate, dark horn 

 colored, generally incrusted with a blackish irregular covering 

 on the spire, and sometimes on the body, which completely ob- 

 scures the obsoletely wrinkled epidermis ; aperture ovate-orbi- 

 cular ; suture impressed. 



Length three-twentieths, breadth one-tenth, of an inch. Cabi- 

 net of the Academy. 



Animal whitish ; head brown ; mouth, tentaciila, orbits, and 



vitta on each side of the neck, white ; tentacula filiform, more 



than half as long as the base of the animal ; rostrum about half as long 



as the tentacula, annulate with darker lines above ; foot white, brownish 



above, short, suboval, truncated before, and rounded behind. 



Extremely numerous on the muddy shores of the rivers Delaware and 

 Schuylkill, between high and low water marks. (Say.) 



Paludina limosa, Say, Journ. Ac. Nat. Sc. Phila. 1, 125 (1817). — Ib. Nich. 

 Encycl. 3d ed. (1819) ; Binney's ed. p. 61.— De Kay, N. Y. Moll. 88. 



Paludina porata, Adams in Thomp. Hist, of Vt. p. 152 (1842) (teste 

 Hald.),— Philippi, Z. fur Mai. II, 77 (1845). 



Amnicola porata, Gould, Inv. of Mass. p. 229, f. 157 (1841). 



Amnicola limosa, Haldeman, Mon. 10, pi. i, f. 5, G (1844?). — Anony- 

 mous, Can. Nat. II, 214, fig. (1857). 



No. 8960 of the collection i.s labelled A. perohtusa by Dr. 

 James Lewis, but I know of no published description under that 

 name. 



From Hudson's Bay and Wisconsin to Virginia. 



