420 LAND AND FRESH-WATER SHELLS OF N. A. [PART IV. 



27. A. viridula, Anthony. 



Jnculosa viridula, Anthont, Proc. Acad. Nat. Sci., p. 68, Feb., 1860. 

 Anculotus viridulus. Anthony, REEVE, Monog. Anculotus, t. 4, f. 34. 

 Leptoxis viridula, Anthony, Binney, Check List, No. 396. 



Description. — Shell ovate, of a uniform, dark green color, rather 



thin ; spire much elevated, composed of 4-5 convex whorls ; sutures 



very distinct; aperture ovate, large, about half the length of the 



_. „_ shell, livid inside; columella well rounded; has a broad. 

 Fig. 837, ' ' ' 



but not well defined sinus. 

 Habitat. — Tennessee. 



Observations. — In form and coloring this species re- 

 sembles Paludina decisa, Say, when that is about half 

 grown, and but for its operculum one would hardly deem 

 it an Anculosa; it is a plain, unadorned species, not 

 liable to be confounded with any other ; its body-whorl is large and 

 subaugulated ; lines of growth well defined and close ; it has a slight 

 disposition to shouldering at the suture ; it is not an abundant spe- 

 cies so far as at present known. — Anthony. 



This shell is figured like all the rest of Mr. Anthony's spe- 

 cies, from the original type, for the use of which I am in- 

 debted to him. Mr. Reeve thinks tliis species is identical with 

 Rogersii, Conrad ; and Dr. Brot believes it to be the same as 

 dilatata. It is a distinct species, but approaches closely to 

 Kirtlandiana. It is found also in North Carolina. 



28. A. ligata, Anthony. 



Anculosa ligata, Anthony, Proc. Acad, Nat. Sci., p. 67, Feb., 18G0. 

 Anculotus ligaHis, Antliony, Reeve, Monog. Anculotus, t. 3, f. 19. 

 Leptoxis ligata, Anthony, Binney, Check List, No. 367. Brot, List, p. 24. 



Description. — Shell ovate, smooth, of a dark green color, rather 

 thick; spire obtusely elevated, composed of about four whorls; sut- 

 ure very distinct; upper whorls flattened; body-whorl con- Fig^83S, 

 slricted at the middle, banded ; aperture ovate, banded within ; 

 columella deeply indented, callous; no sinus at base. 



Habitat. — Alabatna. 



Observations. — This species, of which I have some twenty or thirty 

 individuals before me, seems remarkably constant in character for 

 an Anculosa; and not readily mistaken for any other; ils color, 



