SISTRUM. IS") 



R. DiGiTATA, Lam. PL 5(1, fig. 191 ; pi. 57, lig. 203. 



Shell whitisli externally, columella, lip and interior of aper- 

 ture orange-color. Length, 1-1-5 inches. 



Central Pacific Isles. 



Var. LOBATA, Blainv. PI. 57, fig. 205. 

 Columella and lip dar]< chocolate-color. 



R. BicoNiCA, Blainv. PI. 57, figs. 208-211. 



A revolving row of tubercles forms a shoulder on the bod}'- 

 whorl, and there is another median (and sometimes an inferior) 

 row of less developed tubercles ; these are usuaU,v white, but 

 sometimes dark brown ; interspaces covered hy brown revolving 

 ribs ; more or less longitudinally plicate ; aperture light violet 

 within ; two upper teeth of lip grouped together. 



Length, -75 inch. 



Philippines, 



Purpura rufostoma, Lesson. 



This is evidently a Bicinida, but the description does not 

 suffice for the recognition of the species. It is from the Gam- 

 bier Isles, and has never been figured. 



Subgenus Sistrum, Monff. 



R. MORUS, Lara. PI. 57, figs. 213, 214. 



Usually white (sometimes oi'ange-colored ), the nodules black 

 (sometimes uncolored) ; interior light violet. Length, '6-1 inch. 



Polyyiesiu . 

 Var. ASPERUS. Lam. PI. 57, figs. 215, 210. 



The longitudinal ribs which, in the type are scarcely apparent, 

 here become more pronounced, causing the tubercles to be nar- 

 rower and shar[>er. 



Philippinea. 



Yar. STRiATUS. Pease. PI. 57, fig. 217. 



A depauperate form, with the longitudinal ribs almost con- 

 tinuous and developed at the expense of the tubercles. 

 Length, -7 inch. 



Paumotus. 

 24 



