RISSOINA. 385 



small, spiral ridges, the intersections granular ; whorls 8, flatly 

 convex, subturrited, with deep suture ; outer lip stoutly varicose. 

 Length, 4 mill. 



Viti and Samoa Is. 



Unfigured Species. 



R. BALTEATA, Pease. Sandwich Is 



R. NITIDULA, Gould. China Sea. 



R. VILLICA, Gould. Loo Choo Is. 

 The figure named thus in Conch. Icon, represents It. subvillica, 

 Nevill. 



R. INFREQUENS, C. B. Ad. Panama. 



Section ZEBINELLA', Morch. 1876. 



R. RETICULATA, Sowb. PL 58, figs. 14, 16. 



Subsolid, a little shining, whitish, densely reticulated by equal 

 longitudinal and spiral stria3, suture subplane; whorls 10-12, rather 

 flat ; lip sinuous, produced at the base, subthickened externally. 



Length, 12-14 mill. 



West Indies, Bahamas. 



R. princeps, C. B. Ad. (fig. 16), is a synonym, and I cannot see 

 how Dr. Weinkauff was justified in considering Sowerby's figure to 

 represent a different species from that of Adams' description. In 

 consequence of this opinion he named the former R. pseudoprinceps. 

 R. DECUSSATA, Mtg. PL 58, figs. 15, 17. 



Solid, white, shining, with 25-28 slight longitudinal rib lets, eva- 

 nescent below, crossed by very close spiral lines, suture constricted, 

 margined. Length, 5-6 mill. 



Florida, West Indies. 



First described as British, from a stray specimen. The synonyms 

 are R. cochlearia, Bast., R. subcochlearia, Orb., Turbo arenarius, 

 Maton and Rack., It. alata, Menke, R. pyramidella, Brown, It. 

 striato-'costata, d'Orb. (fig. 17), R. striosa, C. B. Ad., It. eostulina, 

 Sismondi. 

 R. STBIATA, Quoy. PL 57, fig. 91 ; PL 58, figs. 13, 23 ; PL 68, fig. 12. 



Solid, white, with close longitudinal and spiral lines, the former 



obsolete on the body whorl ; whorls 9-10, slightly convex, apex 

 usually decollated, suture linear; aperture expanded, produced 

 below, lip externally thickened. Length, 17'6 mill. 



Philippines, Singapore. 

 25 



