22 VIVIPARA. 



Vivipara decisa, Say — Shell subconic, olivaceous, truncated at 

 the apex ; whirls four, wrinkled across and banded with 

 minute distant striae ; terminal whirl very short ; suture 

 impressed and conspicuous ; aperture subovate, more 

 than half of the length of the shell, entire ; within blu- 

 ish-white. Operculum coriaceous, elevated on the disk 

 and concentrically striated. Length one inch, breadth 

 three-fourths. 



Cochlea virginiana e flava viridescens, non fasciata. 



Lister, Conch, tab. cxxvii, fig. 27. 

 The young shell resembles P. subcarinata, but the whirls 

 ecisa ^j,g (jgstitutg of j^n elevated line, the siiture is not so 

 deeply impressed, and the aperture is narrower above. 

 Animal with the foot larger, suddenly a little dilated each side before 

 and truncate in front, widely ; foot livid, thickly maculated with irregular 

 orange spots, which are much smaller beneath ; head and tentacula spotted 

 with orange ; eyes on a prominent angle, at the external base of the ten- 

 tacula. 



I found the animal viviparous in October ; the young shell had then 

 three complete whirls, which were spirally striated. {Say.) 



Paludina decisa, Say, 1816. Nicholson's Encycl. pi. iii, f. 6 {Limiicca of 

 earlier editions) ; Amer. Conch. I, pi. x. ; ed. Binney, p. 49, 159, 

 pi. X, fig. 1, pi. Ixx, fig. 6.— Philippi, Conch. Ill, 3, pi. i. f. 8.— 

 Haldeman, Mon. p. 4, pi. i (1840). — Gould, Invert, of Mass. 222, 

 wood-cut, p. 144 (1841). — Adams, Hist, of Vermont, p. 151. — DeKay, 

 N. Y. Moll. p. 84, pi. vi, f. 131 ; vii, 134 (1843).— Chenu, 111. Conch, 

 i, f. 1-5.— Mrs. Gray, Fig. Moll. An. pi. cccx, f. 10. — Potiez et Mi- 

 CHAUD, Gall, des Moll. I, 247, pi. xxv, f. 13, 14. — Kuster in Chemn. 

 ed. 2, p. 13, pi. ii, fig. 14-19. 



Melania ocularis, Menke, Syn. Meth. p. 134, teste KiiSTER. 



Paludina limosa, Valenciennes, Rec. d'Obs. II, p. 253, 1839, teste KiiSTER 

 and Haldeman. 



Paludina ponderosa jun., Deshayes in Lam. VIII, 516 (1838), ed. 3, III, 

 455. 



Paludina heterostropha, Kirtland, Ohio Rep. p. 175 (1838). — Tappan, Am. 

 Journ. XXXV, p. 269, pi. iii, p. 2, 1839. 



Paludina microstoma, Kirtland, Ohio Report, p. 175 (1838). 



Paludina rnfa, Haldeman, Mon. Ill, p. 3 of wrapper, pi. iii, f. 1 (1841). 



Paludina cornea, Valenciennes? Rec. d'Obs. II, p. 255, 1833. 



Paludina integra. Say, 1821, Binney's ed. p. 69 ; Journ. A. N. Sc. II, 174. 

 — Haldeman, Mon. p. 10, pi. iii (1840). — Adams, Hist, of Vermont, 

 p. 152.— DeKay, N. Y. Moll. p. 84, pi. vii, f. 132 (1843).— Kuster, 

 Chemn. ed. 2, p. 17, tab. iii, f. 11-13. — Cuenu, 111. Conch, pi. i, f. 

 9-13.— Philippi, Conch. Ill, 4, pi. i, f. 7. 



Paludina genicula, Conrad N. Fr. W. Shells, p. 48, pi. viii, fig. 3, 1831. — 

 KiiSTER in Chemn. ed. 2, p. 14, pi. iii, fig. 5, 6 (1852). — Mullek, 



