NEW MELANID/E OF THE UNITED STATES. 349 



least appearance of colored bands. It is allied to Spillmanii, herein described, but is 

 a shorter shell and not so attenuate. The aperture is more than one-third the length 

 of the shell. 



Io GRACILIS. PI. 39, fig. 217. 



Testa hevi, conica, pallido-purpurea ; spira regulariter conioa; suturis regulariter impressis; anfraotibus 

 instar novenis, plamilatis, in medio angulatis; apertura parviuscula, rhomboidea ; labro aeuto 

 et sinuoso ; columella pallido-purpurea, valde contorta. et deflects, ; canale curtS, et late effusa. 



Shell smooth, conical, pale purple ; spire regularly conical ; sutures regularly 

 impressed; whorls about nine, flattened, angular in the middle; aperture rather 

 small, rhombaidal; outer lip acute and sinuous; columella pale purple, very much 

 twisted and bent out; canal short and widely effuse. 

 True. Acad. Nat. Sci., 1861, p. 394 



Hab. — Coosa River, Alabama, Win. Spillman, M. D. 



My cabinet and cabinet of Dr. Spillman. 

 Diam. -36, Length -90 inch. 



Remarks. — I have two adults before me. They are precisely alike, except that 

 one has an obscure band visible in the inside. It is a graceful, symmetrical species, 

 with a slight purplish tint, which is stronger at the base than at the apex. It is 

 allied to Spillmanii on one side and to viridida on the other, both herein described. 

 The epidermis is rather more shining than usual, and the channel is short and wide. 

 The upper part of the whorls, below the line of the suture, is lighter. The aper- 

 ture is about one-third the length of the shell. 



Io viridula. PI. 39, fig. 218. 



Testa lasvi, cylindrieo couoida, virente ; spira subelevata; suturis parinn impressis; anfraetibus iustar 

 novenis, planulatis, in medio obtuse angulatis ; apertura parviuscula. rhomboidea ; labro acuto. 

 sinuoso ; columella ad basim purpurea, pariim contorta ; canale curt 3, et diktats. 



Shell smooth, cylindrico-conoidal, greenish ; spire somewhat raised ; suture slightly 

 impressed ; whorls about nine, flattened, obtusely angular in the middle ; aperture 

 rather small, rhomboidal; outer lip sharp, sinuous; columella purple at the base, 

 slightly twisted ; canal short and dilate. 



Proc. Acad. Nat. Sci., 1861, p. 394. 



Hab. — Coosa River, Alabama, Win. Spillman, M. D. 



My cabinet and cabinet of Dr. Spillman. 

 Diam. -40. Length -98 inch. 



Remarks. — There are three adult specimens before me. Neither have a perfect 

 spire, but the upper whorls show slight carination. There are a few obscure 

 transverse striae below the angle of the last whorl. The general color is of a faded 

 dark olive green. Along the sutures the color is light. Within the aperture the 

 color is dull purple in two specimens; in the third, there are four obscure-, broad 



89 



