190 



SI STRUM. 



R. NODULOSA, Adams. PI. 59, fig. 275. 



Chocolate or lead-color, the nodules black ; interior chocolate, 

 the teeth white. Length, -6 inch. 



West Indus ; Brazil. 



Mr. Hidalgo in his work on the Mollnsks of the " Viaje al 

 Pacifico," has described Brazilian specimens with great doubt as 

 a variety of R. tuber culata, Blainv. He has sent me specimens 

 which are certainly the same as authentic types of E. noduloxa ; 

 the species is much smaller and different in shape from E. tuber- 

 culata, but the details of sculpture and color are curiously alike. 



R FERRUGINEA, Reeve. PI. 59, lig. 277. 



Blackish, sometimes obscurely white-banded, the nodules 

 black; aperture bluish or chocolate within. Length, '6-*8 inch. 



G-uaymas, Cape St. Lucas. 



A large, thinner species than the preceding, with rather thin 

 outer lip, and more spinous tubercles. Has been confounded 

 with E. carbonaria. Reeve, which is an Engina. 



R. JUGOSA, C. B. Ad. 



The description of this species is so very close to /'. ferrugi- 

 nea, that I suspect them to be identical, although P. P. Carpenter 

 thinks, from an examination of the single type specimen, that it 

 is either an Engina or a Peristernia. The type is white-banded 

 and the " inner lip is excavated, with a few wrinkles above and 

 granules below ; canal moderately long. This species is much 



like a Murex." Length '94 inch, diameter '47 inch. 



Panama, 



R. SIDEREA, Reeve. PI. 59, figs. 276, 278. 



White, irregularly marked with reddish brown square spots. 

 Obsoletely nodosely ribbed, with revolving striae. 



Length, '85 inch. 



Philippines. 



Found on coral reefs and under stones at low water. Does 

 not appear to be closely related to any of the species. It lopks 

 something like a Columbella. I copy a figure (fig. 278) from 

 Von Martens' " Vorderasiatische Conchylien," which is referred 

 to this species : I doubt it. 



