VIVIPARA. 



ST 



Paludina intertexta. 



volutions nearly four ; suture rather deeply in- 

 dented ; umbilicus closed by the lateral extension 

 of the columella. 



Greatest breadth, from four-fifths to one inch ; 

 length, about the same. Inhabits Louisiana. 



We collected many of the shells in the marshes 

 near New Orleans and on the banks of the Caron- 

 delet canal. It is remarkable for its globular form 

 and for the numerous obsolete lines which seem 

 like equidistant deciduous corrugations of the epi- 

 dermis, having no effect whatever in modifying the calcareous surface, 

 upon which it exhibits no trace. In good specimens two or three obsolete, 

 pale bands are visible by transmitted light. 



Paludina intertexta, Sat, 1829, New Harmony Diss. II, 244 ; Am. Conch. 

 3, pi. XXX, f. 3, 4 ; Binney's ed. p. 146, 185, pi. xxx, f. 3, 4.— Hal- 

 DEMAN, Mon. p. 31, pi. X, f. 1—6, 1841.— DeKay, N. Y. Moll. p. 85 

 (1843). — Philippi, Conch. II, 8, pi. ii, f. 4. — Kuster in Cliemn., ed. 

 2, p. 16, pi. iii, f. 9, 10* (1852). 

 Paludina transversa, Say, N. H. Diss. II, 245, 1829 ; Binney's ed. p. 145. 



— DeKay, N. Y. Moll. p. 85 (1843). 

 Ampullaria (?) intertexta, Haldeman, Mon. Ampullaria, p. 11. 



In addition to Mr. Say's localities, I have received it from 

 Grand Coteau, St. Laundry Parish, La. 

 {Blanc.) Also from South Carolina. {Ra- 

 venel.) Yery globose specimens of Viv. 

 vivijyara sometimes are readily confounded 

 at first glance with this species. They are 

 umbilicated. 



One of Mr. Say's figures is copied above 

 (fig. 65). Fig. 66 represents the front view 

 of a more perfect specimen. 



Mr. Say's type of Pal. transversa is still 

 preserved in the Cabinet of the Philadel- 

 phia Academy. It is evidently a young V. intertexta. 

 scription follows, with a view of his type (Fig. 67). 



Paludina transversa, Say — Shell transverse, depressed, orbicular ; spire 

 convex ; whirls three and a half, with numerous minute, slightly elevated 

 revolving lines ; suture not widely indented ; body whirl very 

 convex, short ; umbilicus small ; operculum pale fulvous. 



Greatest width, two-fifths of an inch. Inhabits Louisiana. 



We obtained two specimens in the marshes near New Orleans. 

 It is much wider in proportion to the length than any other „ , ^. 

 species I have seen, exceeding in this respect even j\L subglohosa, transversa. 



Vivipara intertexta. 



His de- 



Fig. 67. 



