GONIOBASIS. 229 



Diameter, -28 (7 millim.) ; length, -50 of an inch (13 millira.). 

 Length of aperture, -26 (7 millim.) ; breadth of aperture, -14 of an 

 inch (3.^ millim.). 



Observations. — Bears some resemblance to M. acuto-carinata, 'Lea, 

 but differs from it in many particulars. It is of a much lighter color, 

 has the carina on every whorl, the body-whorl not excepted, its 

 columella is not remarkably indented as in that species, and it is 

 altogether a thinner and broader shell. The aperture is generally 

 uncolored, but some specimens present a faint tiuge of violet there. — 

 AntJiony. 



M. torulosa, Anth., is only a variety of the above, a number 

 of specimens before me exhibiting every gradation between the 

 two species. The following is the description : — 



Melania torulosa. — Shell conic, chestnut-colored, rather thick ; 

 spire little elevated, acute; whorls 7-8, strongly carinated a little 

 above the suture; sutures linear; aperture not large, broad, ovate, 

 purplish within ; columella regularly but not remarkably curved, with 

 a small sinus. 



Habitat. — Tennessee. 



Diameter, -28 (7 millim.); length, -58 of an inch (15 millim.). 

 Length of aperture, '23 (6 millim) : breadth of aperture, -15 of an 

 inch (4 millim.). 



Observations. — But a single specimen of this species is before me, 



but it differs so much from all others that I cannot hesitate to 



Fig. 454. 

 place it among well established species. M. acuto-carinata, 



Lea, is the only one with which it may be compared, but that 



species has the carina obsolete on the body-whorl, the very 



point w'here it is most remarkably developed in this; the 



whorls also in the M. torulosa diminish much more rapidly to an 



acute apex, which in M. acuto-carinata is said to be obtusely elevated ; 



the J/, torulosa is remarkable for its acute elevation from the broad 



base of the carina on the body-whorl. In the columella too of the 



present species there is no indentation, while in M. acuto-carinata it is 



•' remarkably Indented." — Anthony. 



