RISSOINA. 385 



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

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

 Length, 4 mill. 



Viti and Samoa Is. 



Unfigured Species. 



R. BALTEATA, Pease. Sandiuich Is 



R. NiTiDULA, Gould. China Sea. 



R. viLLiCA, Gould. Loo Choo Is. 



The. figure named thus in Conch. Icon, represents R. suhvillica, 

 Nevill. 



R. iNFREQUENS, C. B. Ad. Panama. 



Section Zebinella, Morch. 1876. 



R. RETICULATA, Sowb. PI. 58, figs. 14, 10. 



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

 longitudinal and spiral striae, suture subplaue; whorls 10-12, rather 

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



Length, 12-14 mill. 



West Indies, Bahamas. 



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

 how Dr. Weinkaufl" 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 iormer B. pseudoprinceps. 

 R. DECUSSATA, ^Nltg. PI. 5S, figs. 15, 17. 



Solid, white, shining, with 25-28 slight longitudinal riblels, 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 B. cochlearia. Bast., B. subcochlearia, Orb., Turbo arenarins, 

 Maton and Rack., B. alata, Menke, B. pyramidella, Brown, B. 

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

 Sismondi. 

 R. STRIATA, Quoy. PI. 57, fig. 91 ; PI. 58, figs. 13, 23 ; PI. 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, jiroduced 

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



Philippines, Singapore. 

 25 



