56 



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



Observations. — A large and beautiful species, common in the Ten- 

 nessee River at Florence. It is perhaps most nearly allied to 31. Sayi 

 Fijr, 107. Fig. lOG. Fig. 108. (-^^^ canaliculata, Say), but the 



elevated line and form of the 

 tubercles will distinguish it from 

 that species. The epidermis is 

 reddish-brown or black. — Conrad. 



Fig. 109. 



Mr. Conrad's figure not being a very 

 good one I have had a figure drawn 

 from a fine specimen from the original 

 localit}^, kindly furnished to me by 

 ]\Ir. Lea. I have included rorata, 

 Reeve and Sj^iUmanii, Lea, in the 

 synon3'my of this species, finding no characters by which to 

 distinguish them. I liave already expressed a 

 doubt whether any of the species immediately 

 following xindxdata are really distinct from it. 



The figures of the accompanying descriptions 

 are copies of those of Messrs. Reeve and Lea. 



Melania romto.— Shell pyramidally conical, brown- 

 ish-olive, spire raised, whorls 10-11, slopingly con- 

 vex, corded throughout with rather close-set ridges, 

 some of which are beaded ; aperture ovate, columella 

 callous, twisted, effusely channelled. 



Habitat. — Alal)ama. — lieeve. 



The following species may be regarded as an immature form 

 of excuratum rather than as a distinct species. 



lo Spillmanii. — Shell smooth, attenuately conical, pale horn-color; 

 spire regularly conical, striate above; sutures slightly impressed; 

 Avhorls about ten, flattened, obtusely angular in the middle ; aperture 

 small, rhomboidal; outer lip sharp and sinuous; columella white 

 and very much twisted ; canal short and subeflTuse. 



//«6i7rtt— Tennessee River, Alabama? Wm. Spillman, M. D. 



Diameter, "40; length, r25 inches. 



Observations.— T:\i\s species is nearly allied to modesta, herein 

 described, but may be distinguished by its longer and more attenuate 

 spire, the upper whorls being covered with regular close transverse 

 striai. The channel is also rather longer and more twisted. One 



