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



Melania nigrostoma, Anthony.— Shell conically ovate, deep purple- 

 black within and without, whorls five, flatly sloping, smooth, the last 

 Fig. 252. rather stout, obtusely angled in the middle ; aperture ovate. 

 Anthony, manuscript. 



Habitat. ? 



Observations. — A dense purple-black species, received from 

 Mr. Anthony with the above name, without habitat. — Eeeve. 



Mr. Reeve first figured this species by mistake (No. 367) as 

 7iigrina., Lea. 



Melania opaca. — Shell ovate, thick, smooth, of a dark brown color; 

 spire short, composed of about six convex whorls ; body- p; 253. 

 whorl large, subangulated in the centre ; sutures indicated 

 by a narrow lighter line, and very distinct; aperture ovate, 

 livid within; columella indented, and tinged with purple; 

 outer lip a little curved ; sinus not remarkable. 



Habitat. — Alabama. 



Observations. — A dusky inconspicuous shell of no great beauty. 

 Only two specimens have ever come under my notice, but I am per- 

 suaded, nevertheless, that they are distinct — cannot well be compared 

 with any other species. More smooth than 31. athleta (nobis) and 

 devoid of ribs, which that species has. Its dark, dirty brown color 

 down to about the middle of the body-whorl, and pale olive-green 

 underneath, together with its purple columella, may sufficiently distin- 

 guish it. — Anthony. 



An examination of Mr. Antliony's type specimen of opaca 

 convinces me tliat the species is the same as iostoma. Mr. 

 Lea agrees with me that his PL Tennesseense described below 

 is a synonyme. 



Fl. Tennesseense. — Shell smooth, obtusely conical, very much 



inflated, rather thick, dark brown; spire short and very 

 Fig. 254. 



obtuse, sutures impressed; whorls about six, convex; aper- 

 ture large, subrhomboidal, dark within; outer lip acute, 

 much expanded below ; inflected and very sinuous : colu- 

 mella very much thickened below, and twisted. 



Habitat. — Tennessee ; Drs. Troost and Currey : Lebanon 

 County, Tennessee ; J. M. SafTord. 

 Diameter, -47 ; length, -84 inch. 

 Observations. — I have four specimens of this species. The two 



