348 NEW MELANIDiE OF THE UNITED STATES. 



Io Spillmanii. PL 39. fig. 215. 



Testa ljcvi, attenuato-conica, pallido-eomea; spira regulariter conica, superno striata; suturis leviter 

 impressis ; anfractibus instar denis, planulatis, in medio obtuse angulatis ; apertura parvS., rhomboidea; 

 labro aeuto et sirmoso ; columella alba et valde contorta ; canale curta et subeffusa. 



Shell smooth, attenuately conical, pale horn-color ; spire regularly conical, striate 

 above ; sutures slightly impressed ; whorls 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 subeffuse. 

 Proo. Acad. Nat. Soi., 1861, p. 394. 



Hab. — Tennessee River, Alabama? Win. Spillman, M. D. 



My cabinet and cabinet of Dr. Spillman. 

 Diam. - 46, Length 1*25 inch. 



Remarks. — This 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 striae. The channel is also rather longer and more 

 twisted. One only of four specimens received is full grown. This has, above the 

 angle of the last whorl, a few undefined tubercles. Below this angle there are five 

 or six well defined transverse stride. None of the specimens have bands. Should 

 adults generally be found with tubercles, then this species should be placed in the 

 tuberculate group and not in the smooth one, where I have now placed it in the 

 above description. The aperture is nearly one-third the length of the shell. I have 

 great pleasure in dedicating this species to Dr. Spillman, who has done so much for 

 the natural history of his own and other Southern States. 



Io modesta. PL 39, fig. 216. 



Testa, lsevi, conica, virido-cornea ; spira. regulariter conica ; suturis impressis ; anfractibus noveuis, planu- 

 latis, in medio angulatis ; apertura parva, regulariter rhomboidea ; labro acuto et sinuoso ; columella 

 alba et valde contorta ; canale curta et effusa. 



Shell smooth, conical, greenish horn-color ; spire regularly conical ; sutures im- 

 pressed; whorls nine, flattened, angular in the middle; aperture small, regularly 

 rhomboidal ; outer lip sharp and sinuous ; columella white and very much twisted ; 



canal short and effuse. 



Proc. Acad. Nat. Sci., 1861, p. 39-1. 



Hab. — Tennessee River, Alabama ? Wm. Spillman, M. D. 



My cabinet and cabinet of Dr. Spillman. 

 Diam. "39, Length -88 inch. 



Remarks. — I have about a dozen of various ages before me. There is no variation 

 in them, either in color or form, but some are slightly carinate towards the apex. 

 None have bands. The channel is short and the outer lip flattened out, so that this 

 species closely impinges on the auger-mouthed Melanuhv. None before me have the 



