262 



C. ( RISSOA^ GRACILIS Macg. Ab. p. 152. Tur- 

 reted, subcvlindrical, of six thin pellucid glossy 

 moderately convex whorls, the suture deep ; mouth about 

 one fourth of the length, ovate, oblique, a little narrowed 

 behind, the peristome complete, thickened externally on 

 the outer lip, thinner and direct on the inner, leaving a 

 very small cavity : hyaline white, brownish red around 

 the mouth. Aberdeen. 0,102.. .0,025. Very like 

 Rubra but is less attenuated and the mouth rounder. 



