CYCLOSTOMA. PLANOBBIS. 41 
C. sutcatum of Draparnaud. Ovate-conoid, 
yellowish or reddish flesh-colour, spirally fur- 
rowed, and decussated by most minute longi- 
tudinal strie; mouth circular, and perpendicular 
to the axis of the shell; lip simple, and thickish. 
faan. 'T. 76. 
C. TRUNCATULUM. Cylindraceous; apex trun- 
cated, sub-pellucid, rather solid, more or less longi- 
tudinally striated, reddish horn- colour; mouth 
ovate; lip reflected. . 
LES LYMNEENS. 
PLANORBIS. FLUVIATILE. 
Discoid, spire depressed ; volutions apparent on 
both sides; aperture oblong, and lunate; axis 
of shell remote ; margin not reflected ; no oper- 
culum. . 
P. coRNUARIETIS. Reversed, solid, flattish 
concave and white above, beneath widely um- 
bilicated and reddish brown; whorls cylindra- 
ceous, smooth; the last banded with chestnut 
brown; diam. 14. W. 33. 55. 
P. corneus. Deeply umbilicated above and 
rusty brown, beneath flattish and whitish ; whorls 
