354 LAND AND FKESH--\VATEK SHELLS OF N. A. [pART IV. 



has a smaller aperture, proportionally, than is common in the genus ; 

 the bands within the aperture are five in number, very dark, and the 

 three central ones are disposed to be confluent; a dark, broad band 

 revolves around the base of the shell. Compared with ScMzostoma 

 pagoda, Lea, it differs in color, in its more elongate form, and by the 

 character of its carina, which are more uniform, the main variation 

 being that they are more diffused on the whorl, whereas, in Mr. Lea's 

 species they are particularly conspicuous near the apex. — Anthony. 



I give below Mr. Lea's description of ScMzostoma Show- 

 altcrii, from the Journal of the Academy of Natural Sciences. 



Schisostoma Showalterii. — Shell transversely ribbed, subcylindrical, 

 thick, chestnut-color, minutely striate; spire elevated; sutures im- 

 pressed; whorls flattened; fissure rather large and deep; aperture 

 Fiff 671 rather small, elliptical, banded within; columella thick; 

 outer lip slightly crenulate. 



Operculum ovate, widi the polar point near the inner 

 lower edge. 



Habitat. — Coosa River, at Uniontown, Alabama; E. H. 

 Showaltcr, M.D. 

 Diameter, -40 ; length, -98 of an inch. 

 Observations. — It is somewhat like pagoda (nobis), but is much 

 larger, more robust and subcylindrical. It also has more and larger 

 ribs, which are very prominent. The specimens before me have on 

 the last whorl seven ribs, the three lower ones being small, the three 

 middle ones large, looking like cords wrapped round the shell. 

 These are of a lighter brown. Two ribs only are visible on the 

 upper whorls. The fissure in the lip is three-tenths of an inch long. 

 The apex being eroded, I am unable to describe that part, nor can I 

 give, consequently, the number of whorls, but they are likely to be 

 seven or eight. — Lea. 



S. pagoda., Lea, is distinguished from this species, besides 

 the above characters, by its short and oblique slit. Mr. Reeve 

 figures, in species 23, Melatoma Showalterii, which certainly 

 does not apply to this species, but rather to Mr. Lea's S. 

 pumilunu 



