162 XENOPHORA. 



irregularly slightly undulated on its edge ; agglutinating only 

 at or near the apex. Diam. 2 inches. 



Indian Ocean. 

 X. Wagneri, Phil., is a synonym. 



X. HELVACEA, Phil. PL 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. CARIB^A, Petit. PI. 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. 



Ixle of Marie Galante, West Indies. 



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



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

 angle ; base subconvex, strongly spirally stilcato, 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. 



