44 VIVIPARA. 



Species numerous, of wliicli I have already twelve, all fluviatile, from 

 rivers and creeks. [Rafinesque.) 

 Omphemis plaioxis and lacustris of Rafinesque are mentioned by name only 

 (Journ. de Phys. 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 a,nd plaioxis, which is fluviatile. (^Rafinesque.) 

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

 of Leptoxis as well as Rafinesque's description, translated 

 ^^' from the work referred to, p. 424. The figure (77) is 



copied from the same MS., written in the well-known 

 hand of Rafinesqiie. 



Leptoxis, 1. c, differs 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. (^Rafinesque.) 



To the genus Amnicola must be referred the following : — 



Paludina sayana, Kustee, Chemn. ed. 2, p. 48, pi. ix, f. 30-32. 



Paludina emarginata, Kustee, 1. c. p. 50, pi. x, f. 3, 4. 



Paludina cincinnatiensis, Kuster, = Amnicola cincinnatiensis of Anthony. 



Paludina lapidaria, KiJSTER, 1. c. 



Paludina porata, Kijster, 1. c. and of Philippi. 



Paludina lustrica, KiJSTER, 1. c. 



Paludina granosa, Sat, of Kirtland's Ohio Report ; probably Amnicola 



granum, Say. 

 Paludina grana. Say. 

 Paludina limosa, Say. 

 Paludina nickliniana, Lea, q. v. 

 Paludina obtusa. Lea, q. v. (not of Teoschel). 

 To the genus Leptoxis are to be referred the following species : — 



Paludina mdtalliana, Lea, Tr. Am. Phil. Soc. VI, 101, pi. xxiii, f. 109. 



(Amnicola nuttalliana. Cooper, Minn. Rep. p. 374.) 

 Paludina virens, Lea, 1. c.VI, 91. 

 Paludina fontinalis, Philippi, Conch. II, 5, p. 136, pi. iii, f. 9, and KiIster 



in Chemn. ed. 2, p. 56, pi. x, f. 27, 28 = Leptoxis isogona, Say. 

 Paludina dissimilis. Say (Binney's ed. p. 48), and Potiez and Michaud, 



Gal. des Moll. 

 Paludina altalis Ravenel, Cat. 

 Paludina isogona, DeKay, N. Y. Moll. 85. 



Paludina pallida, Lea, Tr. Am. Phil. Soc. VI, 22, pi. xxiii, f. 104. 

 Paludina crenata, Say, Is mentioned as a species of Leptoxis by Dr. Brot 



in his admirable "Materiaux pour servir a I'etude de la famille des 



