184 RiriNULA. 



Yar. CLATHRATA, Laiu. IM. 5(i, figs. 19t, 198. 



Brownish white externally, violet within; the lip and colu- 

 mella whitish, stained and marked with brown. 



Length, 1-25-1 75 inches. 



Central Pacific, on coral reefs. 



Var. Laurentiana, Petit. IM. .5(i, fig. 192. 



This shell, of which only a single individual is known, has the 

 exterior surface covered with a parasitic growth, which obscures 

 its color. Within the mouth it is rose-colored, and the lip and 

 columella are yellowish brown. Jjength, -8 inch. 



Locality unknown. 



Most nearly related to var. .speriosa, Dnnker. 



R. iodostoma. Lesson. PL 56, fig. 199. 



Surface not tuberculate, light brownish with incised revolving 

 lines, and four or five dark chocolate bands. Columella with 

 three or four plications ; teeth of outer lip grouped ; ay^erture 

 rosy violet within. Length, 1-1*75 inches. 



Tahiti : Sts. MornsKar : New Zealand.. 



Very closely allied to R. horrida: but distinguished by its 

 colored bands and absence of tubercles. 



R. horrida. Lam. PI. 56, figs. 201, 202. 



L^sually white or very light brown ; the tubercles or short 

 spines black ; interior deep violet. Length, 1-1-75 inches. 



Philippines to Sandwich Isles. 



R. RiciNUS, Linn. PI. 56, fig. 200 ; pi. 57, figs. 204, 206, 212. 



White or yellowish brown ; the tubercles or spines black ; 

 aperture white, the lip sometimes tinged with ^^ellow. 



Length, •75-1-25 inches. 



Red Sea; Benguela, Natal, Guinea., Japan, Philippines, 



New Zealand, Polynesia. 



Var. ELEGANS, Brod. PI. 56, fig. 193. 



Varies from the type in the external surface being uniform 

 white, and the lips of the aperture encircled by a narrow brown 

 band. Length, -5-75 inch. Paumotus Isles. 



Mr. Pease remarks of this var. that its variation from the 

 type is parallel to that of B. lobata from B. digitata. 



