388 RISSOINA. 



spiral sculpture alone persists to the last whorl, where it also be- 

 comes obsolete ; lip varicose. Length, 28 mill. 



Philippines. 



It is R. Cumingii, of H. and A. Adams, not Reeve. 

 R. ANTONI, Schwartz. PL 58, fig. 26. 



Solid, white ; whorls 7-8, well rounded, with channeled suture, 

 the earlier whorls longitudinally ribbed, nodulously cancellated by 

 three revolving ribs, on the penultimate the spiral sculpture is most 

 prominent, and on the body whorl there is no sculpture except a 

 narrow shoulder ; lip thickened and varicose. Length, 7*8 mill. 



Java. 



R. SPIRATA, Sowb. PI. 58, figs. 27-29 ; PI. 59, figs. 30-32, 35-37. 



Shell rather solid, smooth, microscopically spirally striate, some- 

 what shining, white ; whorls 7-8, flattened, the earlier ones with 

 longitudinal costee, often subject to a torsion of the axis, suture nar- 

 rowly channeled ; lip thick, but not varicose. 



Length, 15-23 mill. 



Indian Ocean, Japan, Philippines, New Caledonia, Viti Is. 



The above description has necessarily been rendered so as to 

 cover a little variation in form and sculpture, necessitated by the 

 inclusion of several names as synonyms ; thus some specimens are 

 distorted, others straight, there is a difference in the convexity of 

 the whorls, and some are smooth, varying to those in which faint 

 spiral striae are perceptible. The synonymy includes R. deformis, 

 Sowb. (fig. 27), R. Montrouzieri, Souverb. with its vars. substriolata, 

 monstrosa and convexior of Nevill held by some conchologists to be 

 the R. deformis of the "Conch. Icon." (fig. 35), but not that of the 

 " Genera of Shells," R. supracostata, Garrett (fig. 31), R. striolata, 

 A. Ad. (fig. 30), R. Lamberti, Souverb. (fig. 32), R. Japonica, 

 Weink. (fig. 36), R. d' Orbignyi, A. Ad. (fig. 28), and its vars. sub- 

 mar ginata, subspirata and pachylabris, Nevill, and R. Artensis, 

 Montr, (fig. 37). R. concinna, A. Ad., made by him a species of 

 Microstelma, i's said to be a broken, juvenile of this species. 

 R. ALBIDA, C. B. Adams. PI. 59, fig. 34. 



Diaphanous, whitish, spire sharp, elegantly decussated by longi- 

 tudinal costa? and spiral line ; whorls 10, suture submargined, body- 

 whorl smooth. Length, 6'2 mill. 



West Indies. 



R. affinis, C. B. Ad. (unfigured), is supposed to be a narrower 

 variety of this species. 



