GONIOBASIS. 161 



Diameter, -25 of an inch (G millim.) ; length, -CO of an inch (15 

 raillim.). Length of aperture, -28 of an inch (7 millim.) ; breadth of 

 aperture, -IG of an inch (4 millim.). 



Observations. — A singularly ornamented species, of which only two 

 specimens are before me, and which cannot be compared with any 

 desci'ibed species. The apex is eroded in the specimens under obser- 

 vation, and only five whorls are visible, but it evidently has one more 

 when perfect. The whorls form a shelving shoulder from the suture, 

 and are then nearly flat, the body-whorl being, perhaps, slightly 

 concave. Altogether it presents a remarkable and beautiful appear- 

 ance, and no one need be at a loss to recognize it after once having 

 seen a specimen. Three bands are visible in the interior. — Anthony. 



Melania curvilahris. — Shell conical, smooth, rather thick, greenish 



horn-color ; spire elevated ; whorls 7-8, convex or subangulated ; 



body-whorl angulated, with a depression broad, but not 



•^ Fig. 308. 



deep ; sutures deeply and irregularly impressed ; aperture 



very irregular, by the twisted columella and the sinuous 



curving of the outer lip, within whitish ; outer lip deeply and 



singularly curved, so as to give this part of the shell almost 



a pleurotomose character; columella very much curved and 



indented, leaving a small, umbilical indentation, and having 



a distinct sinus at base. 



Habitat.— Tennessee. 



Diameter, -30 of an inch (8 millim.); length, -72 of an inch (19 

 millim.). Length of aperture, -25 of an inch (G millim.) ; breadth of 

 aperture, -15 of an inch (4 millim.). 



Observations.— May be compared with 31. elegantula in general form, 

 but its peculiarly curved outer lip will at once distinguish it from all 

 others. — Anthony. 



Figured from Mr. Anthony's original type, 

 Melania dbhreviata.—^heW small, ovately conical, turreted, some- 

 _ -no what solid, corneous, acuminate; whorls five, flattened, 

 the last compressed ; aperture rotundately-ovate, con- 

 torted, lip dilated in front, widely sinuated behind. 

 Habitat. — Maury's Creek, Tennessee. 

 Diameter, \ of an inch; length, 4 of an inch. 

 Observations. — A peculiar shell, though not easily char- 

 acterized. Its abbreviated form, shouldered whorls and the com- 

 pression of the last whorl, are among its peculiarities. — Anthony. 



L. F. W. S. IV. 11 



