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MOLLUSCA. 
She- Division I.—Animals with two tentacula. 
Genus 71.—CYCLOSTOMA.— Lamarck. 
Generic Character —Shell variable in shape ; volutions cylin¬ 
drical ; aperture circular, entire, and reflected in the adult state; 
with a horny operculum. 
Ct/clostoma elegans. — The Elegant Cyclostoma. 
Plate LXXXVI. fig. 12. 
Ovate, conical, umbilicated; with line transverse striie; 
volutions very convex ; ash-coloured with three bands of brown 
spots. Half an inch long. Inhabits Europe. 
Genus 72.—AIJRICUL A. — Lamarck. 
Generic Character. —Shell suboval, or ovate-oblong; aperture 
longitudinal; base entire and contracted above, or with the mar¬ 
gins disunited; columella with one or with various plaits; 
outer lip sometimes reflected, and in other species simple. 
Auricula Judce. — Judas Auricula. 
Plate LXXXVI. fig. 13. 
Oblong, conical, cylindrical, thick, with minute decussated 
striae and granulations ; whitish-brown ; columella with three 
plaits. Two and a fourth inches long. Inhabits the East 
Indies. 
Sub-Division II.—Animals with four tentacula. 
Genus 73. — S U C CINE A.— Lamarck. 
Generic Character .—Shell ovate, or ovate-conical; aperture 
very wide, entire, and longitudinal; outer lip acute, but not 
reflected, united to the columella, which is protracted ; columella 
smooth, attenuated and acute; destitute of an operculum. 
Succinea amphibia. — The Amphibious Succinea. 
Plate LXXXVI. fig. 14. 
Amber coloured ; excessively thin and pellucid ; spire short; 
aperture expanding. Three-fourths of an inch long. Inhabits 
the sides of ditches and lakes in Europe. 
