SI STRUM. 187 



synonym ; I add S. squamoaum. Pease (fig. 229), from the per- 

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

 Gould has described, but not figured a S. parvulum collected at 

 Simon's Bay by Stimpson. He distinguishes it from E. tubercu- 

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

 from this species. 



R. OCHROSTOMA, BUiinv. PL 57, tigs. 230, 223. 224; PI. 58, figs. 

 231-234. 



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

 color or yellowish. Length, '75-1*5 inches. 



Australia ; Philippines to Paumotus Isles. 



Varies much in the development of the tubercles, longitudinal 

 ribs and revolving stria?, and has consequently received a number 

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

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

 Engina.* 



Var. HEPT.u.oN'ALis, Reeve. 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 MS . 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 

 C uming at Panama a very doubtful locality, as yet unverified 

 by subsequent collectors ; Kiister figures a specimen from Natal, 

 also somewhat doubtful ; the E. 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 Rowland's Island, appeart 

 to be the same species not adult. 



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



