PALUDINA.— Plate VIII. 



solidd, virescente-olivaced, mifractibm ad sulnras con- 

 slrictis, deinde declivi-convexis, planiusctdis, sub lente 

 minute decussatim undato-slrialis ; aperturd suUri- 

 gono-ovatd, paniusculd. 



The contracted Paludina. Shell pyramidally conical, 

 solid, greenish-olive, whorls constricted at the su- 

 tui'es, then slopingly convex, rather flat, beneath the 

 lens minutely decussately wave-striated ; aperture 

 somewhat triangularly ovate, rather small. 



Lea, Trans. Amer. Phil. Soc. vol. ix. p. 30. 

 Paludina exilis, Anthony. 

 Vivipara coarclata, pars, Binney. 



Hah. Mississippi, United States. 



I follow Mr. Binney in referring Mr. Anthony's P. 

 exilis to Mr. Lea's P. coarclata, but cannot agree with him 

 in referring Sir. Anthony's P. liitia to the same species. I 

 am indebted to the assiduous conchologist of Cincinnati 

 for the loan of the same typical specimens of which Mr. 

 Binney has given outline sketches in his monograph. 

 Here they are represented in finished drawings, and no 

 figures could be more characteristic. It wOl be seen by 

 the numbering of the figures that I determined in the first 

 instance to follow Mr. Binney in giving Mr. Anthony's 

 P. exilis and lima as varieties of one and the same species, 

 but on a fm'ther examination of theii' characters in detail, 

 I revert to the opinion that they are distinct. 



Species 47. (Mus. Anthony.) 



Paludina subpurpukea. Pal. testa suhcylindruceo-tur- 

 ritd, solidd, olivaced, purpurascente pallidissime iinctd, 



avfractibiis ad siduras rude constrictis, superne de- 

 clivi-contractis, deinde rotundatis, nndique plicato- 

 striatis ; aperturd pyriformi-circulari, parviusculd. 



The purple-tinged Paludina. Shell somewhat cylin- 

 drically tun-eted, solid, olive, very faintly tinged with 

 pm-ple, whorls rudely constricted at the sutures, 

 slopingly contracted round the upper part, then 

 rounded, plieately striated throughout ; aperture py- 

 riformly circular, rather small. 



Say, Amer. Conch, vol. iii. pi. 30. f. 2. 



Hab. Southern and v.'estcru United States. 



This species may be readily distinguished by the 

 slopingly contracted growth of the upper part of the 

 whorls, and their constriction at the sutures. 



Species 48. (Fig. 46 b, Mus. Anthony.) 



Paludina lima. Pal. testa oblougo-ovatd, virescente- 

 olieaced, anfractibus co?ivexis, uudique spiraliter sub- 

 remote obtuse liratis, interstitiis concaviusculis, striis 

 mimitis undulatis decussatis ; aperturd ovaid. 



The file Paludina. Shell oblong-ovate, greenish- 

 olive, whorls convex, spirally obtusely rather dis- 

 tantly ridged throughout, interstices slightly con- 

 cave, decussated with minute waved strife ; aperture 

 ovate. 



Anthony, Acad. Nat. Sci. Phil. 18C0, p. 70. 

 Fivipara coarclata, pars, Binney. 



Hab. South Carolina, United States. 



Obviously distinguished from P. coarclata by its light 



oblong-ovate form and characteristic scidpture. 



