404 



LAND AND FRESH-WATER SHELLS OF N. A. [pART lY. 



Diameter, -50; length, -68 of an inch. 



Observations. — This species is about the size of Ancitlosa suhglo- 

 bosa, Say. It is not so regularly rounded, being flattened on the 

 Fig. 804. Fig. 803. Fig. 802. Upper part of the whorl. The striai 

 ai*e minute, and seem to be formed by 

 the lines of growth. There is quite a 

 callus on the superior part of the colu- 

 mella, the middle part being deeply im- 

 pressed. The number of wliorls could 

 not be ascertained from my specimens, all of them being more or 

 less eroded.— Lea. 



Ancidosa tintinnabuhcm, Lea, is a much stronger variety 

 than the last and may for convenience retain its name, under 

 that of subglobosa. It is characterized b}' the whorls becoming 

 wider, heavier, flattened above the middle and having two 

 broad, dark bands, or maculate with brown. The description 

 of this shell is appended, and also that of its young state, 

 called by Mr. Lea Melania virgata. 



Ancidosa tintinnahulum. — Shell smooth, obtusely conical, bell- 

 shaped, banded, very thick, yellow; spire short; sutures impressed; 

 whorls five, impressed ; aperture rather Fig. 805. Fig. 806. Fig. 80T. 

 large, round; columella very thicli, callous 

 above. ^^^ IK^^ 



Habitat. — Tennessee : Tuscaloosa, Ala. ^0*7 ^mU 



Diameter, -4:8; length, -70 of an inch. 



Observations. — The peculiar, constricted lower whorl, giving a cam- 

 panulate form to this shell, will distinguish it at once from other si>e- 

 cies. Six specimens before me are all yellow, with broad, brown 

 bands. A single specimen is pei-fect enough in the spire to make 

 out five whorls. Two of the specimens are white on the columella, 

 and four are tinted with brown. The outline is very remarkable, in 

 its campauulate form. The mouth, in the perfect specimen, is about 

 two-thirds the length of the shell.— Zea. 



Melania virgata. — Shell smooth, rounded, rather thin, yellow, 

 Fig. 808. double-banded, shining; si)ire short; sutures linear; whorls 

 ^mk convex ; aperture large, elliptical, whitish. 

 ^9 Habitat. — Tennessee. 



Diameter, -20; length, -30 of an inch. 



Observations. — A single specimen of this small species was sent 



