235 



Var. pLir.YTOsi'ixosrM I'ilsbry, 1***. PI. .Vj, i\>^<. .">!), lii). 



Rather low-conic, conspicuously radiately plicate above, the fold? 



somewhat siguioid and oblique, bearing a series of short rounded 

 knobs above, and terminating in short spines, eighteen to twenty in 

 number, at the carinated periphery; base flat ; squamosely lirate ; 

 aperture tinged with green, especially at the columella. 



Alt, 20-25, diam. 25-30 mill. 



Hawaiian /x. 



Operculum (pi. b'O, fig. 50) deep green, wrinkled. 



Var. viui'X.iKXs Pease, 1SW). PI. 41), fig. 50. 



Shell conoidal, slightly swollen at the middle ; whorls concave 

 above, rudely irregularly rugosely plicate ; lower margin of whorls 

 encircled by two rows of nodose contiguous scales ; upper whorls 

 deeply pitted, the last acutely carinated at periphery ; base planu- 

 late, with about nine concentric unequal squamose line. 



Alt. 25, diam. 25 mill. 



Ins. Tarawa, Polynesia. 



A. HEX rcus Watson, 1870. PI. 52, figs. 25, 26. 



Shell conical, elevated, light yellowish ruddy, paler below ; whorls 

 7-8, apex round, first whorl flattened, upper three whorls radiately rib- 

 bed, the following radiately slightly plicate in the direction of lines^of 

 growth, with a spiral series of rather large white separate beads upon 

 the edge of the flattened shoulder below the suture, and six series of 

 distinct small beads, separated by interstices of half their breadth 

 upon the slope of the whorl ; periphery sharply bicarinate, the upper 

 carina stellate with sharp compressed hollow spines, about twelve in 

 number on body-whorl ; lower carina with thirty to thirty-five vault- 

 ed scales, becoming spines toward the aperture; between the carnue 

 there are four rows of beads ; base flat, with about ten concentric 

 rows of very regular beads; aperture oblique, white within; colu- 

 mella bluntly toothed below ; umbilical tract polished, slightly 

 ridged, white. Alt. 20, diam. 25 mill. 



Matuka, Fiji, 315 //>-. in <<< tl mm I. 



Operculum (pi. 00, fig. 59) oval, within flat, brown ; outside thick, 

 white, graimlose, with a slight flange on the outer margin. 



Differs from other species of the petrosum group in being granu- 

 late instead of plicate on the upper surface. 



A. PRKVOSTI Sowerby Jr., 1886. PI. 63, fig. 38. 



Shell rather wide-conic, imperforate, green, brown tinged and 

 banded ; whorls about six, subconvex, sloping, encircled by minute 



