SISI'RUM. 187 



synonym; I add S. .s(jiiainosum^ Pease (fig. 229;, from the per- 

 fect concordance of description, figure, and type specimens. Dr. 

 (xould has described, but not figured a 8. ^aruwZwm collected at 

 Simon's Bay b}' Stimpson. He distinguishes it from B. fubercu- 

 hifus, but I cannot find any characters by which to separate it 

 from this species. 



R. OCHROSTOMA, Bhiinv. PL oT, ligs. 23(1. 223. 224; PI. 58, figs. 

 231-234. 



White ; the aperture also, usually white, but sometimes cream- 

 color or 3'ellowish. Length, -Ib-l'b inches. 



Australia ; Philippines to Paumotus Isles. 



Varies much in the development of the tubercles, longitudinal 

 ribs and revolving striae, and has consequently received a number 

 of names. The E. ochrosloma and its var. rvfonotata of P. P. 

 Carpenter, are stated by Mr. Pease to belong to the genus 



Var. HEPTAGOxNALis, Rccve. PI. 58, figs. 235-240. 



Whitish ; more or less stained with brown ; sometimes with a 

 central and inferior band ; yellowish within the aperture. 



The distinguishing feature of the several species described by 

 Reeve, which I write here as a variety is, that the longitudinal 

 ribs are not well developed and the nodules therefore constitute 

 revolving series- The type is said to have been collected by 

 Cuming at Panama — a very doubtful locality, as yet unverified 

 by subsequent collectors ; Kiister figures a specimen from Xatul, 

 also somewhat doubtful ; the R. eburnea of the latter author is 

 founded on a specimen said to come from the Indian Ocean. 



R. CHAIDEA, Duclos. PI. 58, figs. 241, 247. 



White, without and within. Length, -65 inch. 



Philippines ; Australia ; New Caledonia, 



May be only a depauperate var. of the preceding, but the short 

 ventricose form is very characteristic. 



S. rugulosum^ Pease (fig. 247), from Howland's Island, appear* 

 to be the same species not adult. 



* Am. Jour. Conch., iv, 116. 



