162 XENOPHORA. 



irregularly sliglitly undnlated on its edge ; agglutinating only 

 at or near the apex. Diam. 2 inches. 



Indian Ocean. 

 X. Wagneri, Phil., is a sj-nonj^m. 



X. HELVACEA, Phil. PI. 41, 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. 9t, 98. 



Thin, pale yellowish browMi, white beneath, occasionally 

 agglutinating on its irregularly' undulating peripher}^ ; upper 

 surface obliquel3', 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 inclios. 



Ide of Marie Galante, Wed Indies. 



X. Lamberti, Souverbie, PI. 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. PI. 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, surfiice obliquely granularly striate, 



radiately, granularly ridged below ; light yellowish brown. 



Diam. 78 mill. 



Malacca^ Singapore. 



