190 SISTRUM. 



R. NODULOSA, Adams. PI. 59, fig. 2t5. 



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

 the teeth white. Length, -ft inch. 



West Indies ; Brazil. 



Mr. Hidalgo in his woik on the Mollusks of the " Viaje al 

 Pacifico," has described Brazilian specimens with great doubt as 

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

 which are certainly the same as authentic types of B. nodulosa : 

 the species is much smaller and different in shape from R. tuher- 

 cnlaAa^hwi the details of sculpture and color are curiously alike. 



R FERRUGINEA, Reevc. PI. 59, tig. 277. 



Blackish, sometimes obscurely white-banded, the nodules 

 black ; aperture bluish or chocolate within. Length, 'B-'S inch. 



Guaymas, Cape St. Lucas. 



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

 outer lip, and more spinous tnbercles. Has l)een confounded 

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



R. JUGOSA, C. B. Ad. 



The description of this species is so very close to R. 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 tj^pe 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. PL 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 looks 

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

 Von Martens' " A^orderasiatische Conchylien," which is referred 

 to this species : I doubt it. 



