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



three broad, nearly equal, distant, revolving ones. The other three 

 lose all the yellowness of the epidermis, and present an intensely 

 deep purplish brown hue inside and out. The largest of these three 

 has a more constricted aperture than any of the others, and it has 

 revolving striae more distinct towards the base, which I have not 

 observed in the others. The aperture is also quite channelled below, 

 which is indistinct in the others. Another of these three dark speci- 

 mens has a higher spire and a shorter aperture, leaning towards the 

 form of a Melania. The shoulder in many of the specimens is large 

 and well pronounced, while in others it is small. The aperture is 

 about two-thirds the length of the shell. This species reminds one, 

 as to its outline, of Melania xmdosa, Anth., from Kentucky. It is, 

 however, larger, more cylindrical and has the callus on the columella, 

 which undosa, of course, has not. Undosa is also much paler and has 

 a higher spire. I have great pleasui'e in dedicating this species to 

 Dr. Showalter, who is doing so much for the natural history of his 

 adopted state. — Lea. 



This species resembles the preceding, but is less cylindrical, 

 with the aperture wider, and the outer lip more curved. The 

 spire is shorter and more rapidly acuminate. 



8. L. nucleola, Anthony. 



Melania nucleola, Anthony, Proc. Bost. Soc. Nat. Hist., iii, p. 360, Dec, 1850. Bin. 

 NKY, Check List, No. 181. Bkot, List, p. 40. Reeve, Monog., sp. 348. 



Description. — Shell small, thick, eroded, subglobose or subcylin- 



drical, smooth, greenish, encircled by two bauds; whorls 2-3, ven- 



tricose, the last at length cylindrical; aperture 

 Fig. 72. Fi"' 73 



*" ■ semilunar; lip dilated in front, thickened behind; 



columella with a copious callous deposit. 



Habitat. — Tennessee. 



Longitude, k ; latitude, f of an inch. 



Observations. — This species, which resembles 

 closely L. nuclea, Lea, may be distinguished by being rather larger ; 

 differently colored, being light brown; while nuclea has a tinge of 

 green; by having two chestnut-colored bands in place of the four 

 dark ones of Mr. Lea's species ; and by the columella being not so 

 much thickened. It is a rare species, whilst nuclea appears to be 

 rather an abundant one. 

 Belongs to a group of solid, ellipsoidal species peculiar to the re- 



