146 NEW UNIONID^, MELANID^, ETC., 



and kindly lent to me for description. It seems to be most nearly allied to T. Antlio- 

 nyi (nobis,) but it is a smaller species, without the strice and obscure sulcations of 

 that species, and it has a band which I have never observed in Anthonyi, and probably 

 a less number of whorls. It also is somewhat allied to Eartmanii (nobis,) but not so 

 elevated and it is smaller. When Hartmanii is banded it always has, I believe, two. 

 This specimen of univittatum has a single band above the periphery which is observ- 

 able on all the whorls above. The apex being eroded I cannot state the number of 

 whorls, but they seem to be about eight. The aperture is about one-third the length 

 of the shell. 



Trypanostoma Lesleti. PL 23, fig. 59. 



Testa tuberculuta, pyramidata, tenebroso-cornea ; spira elevata; suturLs irregulariter impressis; anfrac- 

 tibus instar octonis, subimpressis ; apertura parviuscula, rhomboidea, intus albida, interdum vittata ; 

 labro acuto, valde sinuoso ; columella incrassata. 



Shell tuberculate, pyramidal, dark horn color ; spire exserted ; sutures irregularly 

 impressed; whorls about eight, somewhat impressed; aperture rather small, rhom- 

 boidal, white and sometimes banded within ; outer lip acute, very sinuous ; columella 

 thickened. 



Ojperculum ovate, dark brown, rather thin, with the polar point near the base. 

 Proe. Acad. Nat. Soi. 18iD4, p. 4. 



Eah. — East Tennessee, Prof. Troost ; Smith's Shoals, Cumberland River, East Ten- 

 nessee, Major S. S. Lyon, U. S. E. ; Pulaski County, Kent., Joseph Lesley, C. E. 



My cabinet. 

 Diam. -80, Length 1-2 inches. 



Bemaylcs. — This species is closely allied to T. undvlatum [Melania undulata) Say, but 

 may at once be distinguished by its lower spire and proportionately wider base, where 

 it is flatter. The undulations on Mr. Say's shell are low, while in Lesleyi these are 

 replaced by well defined tubercles, which are disposed to be compressed and incline to 

 the left. There is only a single row of these tubercles, but those of the row above 

 cause swellings on the upper part of the whorls. In the young state they differ 

 totally, the undulatum being entirely smooth, while the Lesleyi has tubercles to the 

 apex, except that on the two or three first whorls they change into folds. In the 

 multiplicity of nodules it resembles Lithasia {Melania) jpernodosa (nobis). In the 

 spire it also resembles Lithasia [Melania) armigera, Say, and Lithasia {Melania) Jay- 

 ana (nobis.) but differs in the aperture being Trypanostamose and of course not 

 belonging to the same genus. I have ten specimens before me. Those from Troost 

 I have had a long time and believed they might be a variety only of undulatum, but 

 the young sent by Mr. Lesley and Major Lyon convinced me at once that the species 

 was new and very distinct. The aperture is more square than in undulatiom and the 



