46 
BULM1MUS ellipticus. 
TAB. CCCXXXVIL 
Spec. Char. Elliptical, elongated, rather ob- 
tuse, longitudinally ribbed ; ribs numerous, 
very small, straight ; aperture small, twice 
as long as wide, upon the left side. 
Remarkable for the exact similarity in form of the two 
ends, and for the left-handed spire. It is three times as 
long as wide, rather obtuse at both ends, and perhaps 
umbilicated ; the upper angle of the mouth is acute, the 
base rounded ; the columella seems to be a little curved. 
Length sometimes nearly four inches ; the ribs are but 
slightly elevated, and the space between them is concave. 
From the fresh water formation at Schalcomb on the 
Isle of Wight, by favour of Js, Holloway and Prof. 
Sedgwick. 
