90 TRACIIELIPODA. 



FAMILY IX. COLEINACEA. 



Spiral, but without any exterior projections, except the ad- 

 ditions of growth J outer lip frequently reflected ; terrestrial ; 

 tentaculae of the animal cylindrical, and devoid of an operculum. 



Section I. — Animals with two tentacula. 

 Genus 11.— CYChOSTOMA.— Lamarck. 



Generic Character. — Shell variable in shape ; volutions cylin- 

 drical ; aperture circular, entire, and reflected in the adult state ; 

 with a horny operculum. 



Cyclostoma elegans. — The Elegant Cyclostoma. Plate 

 XIII. fig. 12. Ovate, conical, umbilicated ; with fine transverse 

 striae ; volutions very convex ; ash-coloured, with three bands of 

 brown 'spots. Half an inch long. Inhabits Europe. 



Genus 72.— AURIC UhX.— 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. 



Section * Right )ip outwardly reflected. 



** Right lip plain and sharp. 



Auricula Jududoe. — Judas Auricula. Plate XIII. 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. 



Section II. — Animals with four tentacula. 



Genus 73.— SUCCINEA.— DrapernaM^f. 



Generic Character. — Shell ovate, or ovate-conical j 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. 



The shells of this genus never having their lip reflected or thickened, at 

 once distinguish them from tliose of tiie genus Buliinus, to which they bear 

 a blroDg resemblance. 



