RISSOINA. 



387 



body-whorl impressly spirally striate ; whorls 8, slightly convex, 

 with impressed suture; lip scarcely varicose. Length, 4'3 mill. 



Red Sea. 

 R. STRiATULA, Peasc. PL 68, fig. 16. 



Strong, white, closely and thinly sj)irally striate ; whorls convex, 

 suture shallow ; ai)erture effuse below, columella callous, lip not 

 varicose. Length, 9 mill. 



Paumotus Is. 

 R. FLAMMEA, Peasc. PI. 68, fig. 17. 



Solid, whitish, with longitudinal ashy grey stripes, subconfluent, 

 spirally finely grooved, the grooves interruptedly lined with light 

 brown ; whorls plane, suture well impressed. Length, 3 mill. 



Caroline Islands. 

 Described as a Rissoa — which perhaps it is. 



R. Zeltneri, Folin. PI. 68, fig. 19. 



Shell solid, shining, white, with numerous, thin, oblique, longi-, 

 tudinal striae, evanescent below, spiral strife inconspicuous or ob- 

 solete except on the base, where they become distinct and replace 

 the longitudinal sculpture ; columella a little truncate, diagonal, 

 ending in a narrow channel, lip thickened. Length, 4"5 mill. 



Panama. 

 R. MiLLECOSTATA, Garrett. PI. 56, fig. 47. 



Rather thin, white, with numerous, slightly oblique, close, minute 

 longitudinal riblets, and fine spiral striae, both becoming obscure 

 below; whorls 11, flatly convex, with deeply incised suture; peris- 

 tome thick, slightly sinuous above, not varicose. 



Length, 9 mill. 



Viti Is. 



R. siGMiFER, Morch. 

 R. Janus, C. B. Ad. 



R. MODESTA, Gould. 

 R. ANNITLATA, HuttOU. 



Unjigured Species. 



Bahamas. 



Panama. 



Loo Choo Is. 



New Zealand. 



Section Morchiella, Nevill. 1884 



R. GiGANTEA, Desh. PI. 58, fig. 25. 



Solid, somewhat shining, white; whorls 9, convex, the first ones 

 witli longitudinal costal crossed by tliin spiral striie, afterwards the 



