VIVIPARA, 



35 



which causes this tentaculum to appear larger than the other. By this 

 character the male is easily known." 



The vivipara is far less common than the decisa, and seems to be more 

 usually found in the southern part of the Union. Mr. Elliott of Charleston 

 sent me two specimens from the banks of St. John's River, Florida, and 

 Capt. Leconte ;^e3ented me with one, which he obtained at Lake George 

 on the same river. PL 10, the two middle figures exhibit the brownish 

 banded var. 



Puludina vivipara, Say (Lymnjea), 1816. Nich. Encycl. pi. ii, f. 5. Am. 

 Conch., pt. 1, pi. X. Binney's ed. p. 48, 159, pi. Ixx, f. 5. — Halde- 

 MAN, Mon. p. 17, pi. vi (1841).— DeKay, N. Y. Moll., p. 86 (1843). 



Paludina lineaia, Valenciennes, Rec. d'Obs. II, 256, 1833. — KiJSTEK, 

 Chemn. ed. 2, p. 10, pi. ii, f. 6-9 (1852), p. 19, pi. iv, fig. 4. 



Paludina Georgiana, Lea, Tr. Am. Phil. Soc. V, 116, pi. xix, fig. 85, 

 date of title 1837. Obs. ii, p. 228. — Haldeman, Mon. p. 23, pi. vii, 

 f. 1, 2 (1841).— Kuster, in Chemn. ed. 2, p. 15, pi. iii, f. 7, 8 (1852) 

 — DeKay, N. Y. Moll. p. 86 (1843).— Chenu. Man. Conch. I, 310, 

 fig. 2207 (Melantho); lUust. Conch, pi. i, f. 20, 21.— Phiuppi, Conch, 

 iii, 4, pi. i, f. 15. 



A very variable species in the variety of ar- Fig. 59. 



rangement of the revolving bands, sometimes 



quite wanting, as well as in the greater or less 



elevation of the spire, and globoseness of the 



whirls. Figs. 59, 62, represent two forms. 

 Widely distributed, having been noticed 



along the south shore of Lake Michigan, in 



Indiana, Illinois, Missouri, Arkansas, Alabama, 



Georgia, South Carolina, and Florida. 



Authors have doubted the identity of this with the European 

 species whose name I have 

 adopted. I cannot distin- 

 guish some native from some 

 foreign specimens when laid 

 side by side. 



My opinion on Pal. Geor- 

 giana is based on an exami- 

 nation of Mr. Lea's speci- 

 mens. His description is 

 given below, and an outline 

 of his figure, (Fig. 64), as 



Vivipara vivipara. 



Vivipara vivipara. 



Paludina Georgiana. 



well as that of Haldemaq, which was drawn from the type (63). 



