OF CONCHOLOGY. 329 



STREPHOBASIS, Lea. 

 a. Shell ovate -conical. 



1. St. curta, Eald. Figs. 1, 2. Smooth, ovate-conical, 

 thick : spire plane, obtusely conical ; suture impressed ; aper- 

 ture small, sub-quadrate. Greenish or chestnut, with a broad 

 band or without band. Tenn.^ Ky. 



Fig. 1 is typical ; Fig. 2 represents a well-grown specimen, and is soUda, 

 Lea. 



2. St. pumila, Lea. Fig. 3. Smooth, obtusely conical, 

 moderately thick ; spire plane ; suture much impressed ; body 

 whorl sloping, cylindrical, closely striate below the periphery ; 

 aperture small, narrow, oblique. Dark horn-color, whitish 

 within. Tuscaloosa, Ala. 



3. St. carinata, Lea. Fig. 4. Carinate, sub-fusiform, in- 

 flated, rather thin ; spire conical, acute, carinate ; whorls 6, 

 flattened, body whorl inflated; aperture large, rhomboidal, 

 produced below. Greenish, 4-banded. Tennessee River, Tenn. 



Quite young, but doubtless different from the other species. 



b. Shell cylindrical. 



4. St. olivaria, Lea. Fig. 5. Smooth, elliptical or cylin- 

 drical ; spire elevated, obtuse ; suture much impressed ; whorls 

 7, convex, the last large; aperture 2-5ths the total length, 

 rhomboidal, broadly effiised below. Dark olive, generally 

 banded; white or purple, and sometimes banded within. 



4a. St. Lyonii, Lea. Fig. 6. Sub-cylindrical, smooth, 

 thick ; spire obtusely conical ; suture impressed ; whorls 8, 

 slightly convex, the last inflated, cylindrically flattened ; aper- 

 ture sub-constricted, rhomboidal, canaliculately retrorse at 

 base. Dark horn-color, rarely banded, white within. Hohton 

 River, Knoxville, Tenn. 



5. St. plena, Anih. Figs. 7, 8. Smooth, thick, shining; 

 spire obtuse, short, carinate at apex; upper whorls a little 

 convex, the last one constricted ; aperture long, narrow above, 

 square below. Dark brown or greenish, much banded, bluish 

 and banded within. Chattanooga, Tenn.; Ala. 



Fig. 8 is St. Spilbnanii, Lea. 



6. St. cornea, Z'ea. Fig. 9. Smooth, thick ; spire obtuse; 



suture irregularly impressed ; whorls a little convex above, 



the last one constricted ; aperture elongate-rhomboidal, narrow 



above, wider below, base narrowly channelled. Horn -colored, 



yellowish-white within. Chattanooga, Tenn. 



Lighter colored than No. 5, and without bands ; it is also a heavier 

 shell. 



