. DOUBTFUL VIVIPARID.^. 03 



Omphenvs plaioxis and lacustris of Rafinesque are mentioned by name only 

 (Jouru. de Pliys. LXXXVIII, p. 424. The generic description is 

 as follows : — 



Shell oval ; aperture rounded, lips detached, columella separated 

 from the lower lip by a small oblong umbilicus ; spire slightly oblique ; 

 animal with a membranaceous operculum, two flattened lateral ten- 

 tacles, eyes at their exterior base. Family Turbinacea. Two species, 

 0. lacustris &nd. plaioxis, which is fluviatile. {Rajinesque.) 



I take this opportunity of giving a fac-simile of a figure of the animal 

 of Leptnxis as well as Rafinesque's description, translated 

 from the work referred to, p. 424. The figure (127) is ^'S' ^^' 



copied from the same MS. as that quoted on the last 

 page, written in the well-known hand of Rafinesque. 



Leptoxis, 1. c, diflFers from Lymnula by its oval, ventri- 

 cose shell of two or three whirls ; aperture oval, almost 

 as large as the whole shell ; eyes exterior. Four species, 

 fluviatile, &c. (Rajinesqiie.) Animal of Leptoxis. 



To the genus Sotnatogijrus (q. v.) must be referred the/oUowing:— 

 Paludina altilis, Ravenel, undescr. Cat. S. C. 12 (1834). 

 Paludina pallida, Lea. 

 Paludina subglohosa. Sat. 

 Paludina fontinalis, Phil. 

 Paludina isogona, DeKay. 



To the genus Amnicola (q. v.) must be referred the following; — 

 Paludina sayana, Kuster, Chemu. ed. 2, p. 48, pi. ix, f. 30-32. 

 Paludina emaryinata, Kuster, /. c, p. 50, pi. x, f. 3, 4. 

 Paludina cincinnatiensis, Kuster. 

 Paludina porata, KiisTER, /. c. and of Philippi. 

 Paludina lustrica, Kuster, /. c. 

 Paludina granosa, Say, of Kirtland's Ohio Report, p. 174 (1838), and 



Sill. Am. Journ. [i] XXXI, 3(3 (1836) ; probably Amnicola granum, 



Say. 

 Paludina grana, Say. 

 Paludina limosa. Say. 

 Paludina obtusa. Lea (not of Troschel). 



To the genus Pomatiopsis (q. v.) must be referred the following: — 

 Paludina lapidaria, Kuster, /. c. 

 Paludina nicklininna, Lea. 



To the genus Fluminicola (q. v.) must be referred — 

 Paludina nuttalliana, Lea. 

 Paludina nuclea, Lea. 

 Paludina I'irens, Lea. 

 Paludina seminalis. Hinds. 



