162 XENOPHORA. 



irregularly slightly undulated on its edge ; agglutinating only 

 at or near the apex. Diani. 2 inches. 



Indian Ocean. 

 X. Wagneri, Phil., is a synonym. 



X. HELVACEA, Phil. PI. 47, fig. 96. 



Differs from the preceding species in the umbilicus, which has 

 convex sides and is not defined by an angle. 

 Diam. 3 inches. 



Madagascar. 

 Its distinctness from X. Indica is problematical. 



X. CARIBJEA, Petit. PL 47, figs. 97, 98. 



Thin, pale yellowish brown, white beneath, occasionally 

 agglutinating on its irregularly undulating periphery ; upper 

 surface obliquely, slightly undulatingly striate ; lower surface 

 radiately finely striate, shining, with concentric obsolete grooves, 

 bordered by a strong revolving rounded rib, beyond which is 

 the smooth shining peripheral blade. Diam. 2'5 inches. 



Itsle of Marie Galante, West ladies. 



X. LAMBERTT, Souverbie. PL 47, figs. 99, 100. 



Umbilicus partly covered, its walls convex, not defined by an 

 angle; base subconvex, strongly spirally sulcate, the peripheral 

 blade smooth ; upper surface obliquely undulately striate, 

 agglutinating at the suture, but not at the periphery ; light yel- 

 lowish brown. Diam. 2 inches. 



New Caledonia. 



Section ONUSTUS, H. and A. Ad., 1854. 



X. SOLARIS, Linn. PL 49, figs. 1, 2. 



Upper whorls with a few small agglutinating pebbles and 

 shells at the suture, then fringed with regular distant hollow 

 spines on the periphery, surface obliquely granularly striate, 

 radiately, granularly ridged below ; light yellowish brown. 



Diam. 78 mill. 



Malacca, Singapore. 



