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



This species appears to be very closely allied to T. minor, 

 Lea. 



79. P. minor, Lea. 



Trypanostoma minor. Lea, Proc. Acad. Nat. Sci., p. 174, 1862. Jour. Acad. Nat. 

 Sci., V, pt. 3, p. 278, t. 36, f. 95. Obs. ix, p. 100. 



Description. — Shell smooth, obtusely conoidal, rather thick, yel- 

 lowish, baiiclecl; spire obtusely conical; sutures much impressed; 



whorls seven, somewhat convex, the last lari^e ; aperture 

 Fig. 249. » ' t- 



large, subrhomboidal, white and usually banded within; outer 

 lip acute, sinuous; columella incurved, thickened below and 

 slightly twisted. 

 Habitat. — Tennessee ; Prof. Troost. 

 Diameter, -32 ; length, -54 inch. 

 Observations. — Four specimens were found among a number of young 

 shells from Prof. Troost. It is a modest little species which might 

 easily be taken for a young 3Ielania conica, Say. It is most nearly 

 allied to hivittata, herein described, but may be distinguished by 

 being wider in proportion, having a shorter spire, being less polished, 

 and not so bright a yellow. It differs also in the brown bands being 

 much less distinctly marked, the upper whorls showing none, while 

 the other is beautifully banded to the apex. The two species differ in 

 columella, minor having nearly half of it perpendicular, while hivittata 

 has that portion twisted backwards. The bands seem to be uncertain 

 in this species, one having two bands, two having one band and the 

 other having no band. The aperture is nearly half the length of the 

 shell. — Lea. 



It is very probable that this is the juvenile of some described 

 species. 



80. P. pumilum, Lea. 



Trypanostoma pumilum, Lea, Proc. Acad. Nat. Sci., p. 174, 18G2. Jour. Acad. Nat. 

 Sci., v, pt. 3, p. 279, t. 36, f. 96. Obs. ix, p. 101. 



Description. — Shell smooth, shining, conoidal, rather solid, yellowish- 

 green, double-bauded ; spire obtusely conical; sutures much im- 

 pressed; whorls seven, somewhat convex, the last very large; aper- 

 ture rather large, rhomboidal, whitish and double banded within ; outer 

 lip acute, sinuous ; columella thickened below and very much twisted. 



Habitat. — Tennessee ; Prof. Troost. 



Diameter, 'Z8; length, -71 inch. 



