40 LAXD AND FRESn-AVATER SHELLS OF N. A, [PART IV. 



the middle of the edge of the outer lip at each stage of growth, — a 

 character I have not observed in any other species of Melanidce. I 

 suspect that this species will generally be found to be banded. One 

 of the two specimens before me has six well-defined bands, which 

 are indistinct on the outside, but are well marked on the inside. The 

 other has only one band, and this is visible only on the upper whorls, 

 the aperture being whitish, with a brown, indistinct baud at the 

 base. The' upper callus is well marked, and the channel below is 

 well defined. The aperture is more than one-third the length of 

 the shell. I have great pleasure In naming this fine species after 

 Major T. C. Downie, to whom I owe the acquisition of many new and 

 rare moUusks. — Lea. 



Subgenus STREPIIOBASIS, Lea. 



JStrephohasis, Lea, Proc. Acad. Nat. Sci., p. 96, April, J 861. Jour. 



Acad. Nat. Sci., v, pt. 3, pp. 204 and 355. Obs., ix, pp. 86, 177. 

 Megara (sp.), H. & A. Adams, Genera, 1, p. 306, Feb., 1854. 



A. Shell ovate-conical. 

 1. S. curta, IIaldemax. 



Melanxa curia, IIaldemav, Monog. Limniades, No. 3, p. 3 of Cover. Binnet, 

 Check List, Kg. 80. Brot, List, p. 3'2. Keeve, Monog., sp. 345. 



Melanta solida. Lea, Philos. Trans., t. 9, f. 27. Obs., iv, p. 57. Binney, Check List, 

 No. 245. BuoT, Li.«t, p. 31. Reeve, Monog. Melaui.i, f. 454. 



Streplwhasis solida, Lea, Jour. Acad. Nat. Sci., v, pt.3, p. 2(JG, t. 35, f. 77. Obs., ix, 

 p. 88. 



Megara solida. Lea, Adams, Genera, i, p. 306. 



Description. — Shell short, conical, smooth ; spire plane, nearly twice 

 ■p- gj as long as the aperture, Avhich is narrow and quadrate with 

 a narrow anterior sinus ; color green or chestnut. 

 Habitat. — Ohio River. 

 Length, % of an inch. 



Observations. — Resembles M. conica, Say, but the whorls 

 increase more rapidly in size. — Haldeman. 



The above description is not a satisfactory one, but the shell 

 is recognized as identical with solida 'by authenticated t^'pes 

 in the collection of Mr. Anthony, one of which is here fig- 



