GONIOBASIS. 201 



aperture small, ovate, -within whitish, tinged near the base with rose ; 



columella rounded, and formin": a sliirht sinus at base. 



Fig. 393. 

 Diameter, -40 of an inch (10 millim.) ; length, 1-35 inches 



32 (millim ). Length of aperture, -40 (10 millim.); breadth 



of aperture, -23 of an inch (6 millim.). 



Habitat. — Tennessee. 



Observations. — A stout species, and one of the most beau- 

 tiful with which I am acquainted. The ribs are not strongly 

 expressed, and on the lower Avhorls are nearly obsolete, 

 having there the appearance of stria) of growth merely; body-whorl 

 a little angulated at base. — Anthony. 



Figured from the type specimen. 



Melania glauca. — Shell conical, folded, of a green color in the 

 lower whorls, often modified by a brown tinge on the upper ones; 

 whorls ten, slightly convex, with prominent longitudinal ribs, obso- 



_,. „„, lete on the body-whorl ; sutures well defined, but not 



r ig. oUl, 



deeply marked; aperture ovate, livid within and with 

 occasionally a faint, rosy tinge there; columella angu- 

 lated at the middle ; sinus well defined. 

 Habitat. — Tennessee. 



Observations. — A stout species, with prominent, curved 

 ribs on all the upper whorls, those on the body-whorl 

 being less clearly defined or else absolutely wanting. 

 Color a beautiful apple-green, relieved by a broad, yellow band near 

 the suture ; ar.d this color often passes into a yellowish-brown on 

 the upper whorls. Near the apex, the folds are often traversed by 

 four or five prominent strife, which pass over without being inter- 

 rupted by the longitudinal ribs. May be compared with 31. virichda 

 (nobis) as to color, but is less slender, and the ribs at once distin- 

 guish it. — Anthony. 



The figure, which is a very poor one, represents the t3'pe 

 specimen. The species is better ilhistrated by the figure of 

 G. Lyonii, which is a synonyme. The following is a descrip- 

 tion of the latter 



Goniobasis Lyonii. — Shell folded, striate above, carinate at the 

 apex, yellowish, very thin, very much drawn out; spire attenuate, 

 sharp-pointed; sutures irregularly impressed; whorls nine, slightly 



