238 LAND AND FRESII-WATER SHELLS OF N. A. [PART IV. 



readily distinguishable by its more slender proportions, thinner text- 

 ure, lighter color, and above all by its peculiarly shaped whorls, 

 which, increasing regularly, and being carinate at their bases, have 

 somewhat the appearance of the roof of a house, hence its name. 

 Lines of growth distinct; one or two indistinct, narrow bands are 

 often visible on the shell ; a very neat and graceful species. — Anthony. 



The following is the description of macella, which, notwith- 

 standing the wide difference of habitat, appears to be the same 

 in every respect as tecta : — 



Gojiiobnsis macella. — Shell carinate, awl-shaped, thin, olivaceous, 

 without bands; spire subattenuate ; sutures very much impressed; 

 Fiff 463 '"'^iorJs seven, somewhat convex; aperture very small, sub- 

 rhomboidal, whitish within ; spotted at the base ; outer lip 

 acute ; slightly sinuous ; columella bent in and slightly twisted. 

 Operculum ovate, thin, light brown, with the polar point 

 well in from the left of margin. 

 Habitat.— Coosa River, Alabama ; Prof. Brumby. 

 Diameter, -22 ; length, -02 of an inch. 



Observations. — This is a little species received from Professor 

 Brumby a long time since. It is closely allied to rubella, herein 

 described, but differs in being somewhat smaller, in color, in having 

 rather flatter whorls and in having a brown, elongate spot at the 

 base of the columella inside. The few specimens before me are 

 minutely veined on the lower whorl. The upper whorls are carinate 

 and substriate. The aperture is about one-fourth the length of the 

 shell. — Lea. 



126. G. hybrida, Anthony. 



Melania hyhrida, Anthony, Proc . Acad. Nat. Sci., p. GO, Feb., 1860. Bin-net, Check 



List, No. 140. IlROT. List, \^. 36. 

 Melania subcarinatu, Antliony, IlEEVE, Monog. Melania, sp. 382. 



Description. — Shell conical, elevated, nearly smooth, horn-colored; 

 whorls 8-9, upper ones carinated deeply, lower ones entirely smooth ; 

 color reddish-brown, or dark horn-color; sutures distinctly impressed; 

 aperture small, ovate, tinged with rose-color or violet within ; colu- 

 mella rounded, but uot deeply indented ; sinus small. 



Habitat. — Tennessee. 



Observations.— A neat, pretty species, with no very strong, dis- 



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