XENOPHORA. 161 



crowded, more minutely granular ; umbilicus slightly impinged 

 on by the columellar callus, striate within. Diam. 16 mill. 



West Coast of Africa. 



Differs from the preceding species in having fewer basal 

 costulations, with stronger granules upon them ; differs also in 

 its subrhomboidal, thin, corneous operculum having the striae a 

 little angular in the middle. It is X. caper ata, Petit (non 

 Phil.), and X. crispa, Martens (non Konig). 



X. CONCHYLIOPHOEUS, Born. PL 46, fig. 89. 



Light brown, rugosely obliquely striated, profusely agglu- 

 tinating large shells, stones, etc., so as almost to conceal the 

 upper surface, face concave, imperforate in the adult, with 

 strong, crowded, curved growth-lines, and nearly obsolete con- 

 centric low narrow ridges. Diam. 2 inches. 



West Indies. 



It is X. trochiformis, Bjrn, A", agglutinans, Lam., X. onustus, 

 Reeve, X. meandrina, X. vulcania, X. Iricostata, and A'. Isevi- 

 gata, Fischer de Waldh., etc. 



X. ROBUSTA, Verrill (unfigured). La Paz, L. Calif. 



X. DIGITATA, Martens (unfigured;. West Africa. 



X. CAVELIERT, Rochebrune (unfigured). Senegambia. 



Section TUGURIUM, Fischer, 1880. 

 X. EXUTA, Reeve. PI. 46, figs. 90, 91. 



Suture and periphery undulated, upper surface occasionally 

 agglutinating at the suture near the apex, but usually free from 

 foreign bodies, oblique^ 7 undulately striated and grooved ; under 

 surface shining, smooth, surrounded by a border of several close, 

 rugose revolving striae, umbilical funnel closety striated ; yel- 

 lowish or orange-brown, lighter colored beneath. 



Diam. 2*75 inches. 



China. 

 X. INDICA, Gmelin. PI. 46, figs. 92, 93. 



Finely obliquely striated, yellowish brown, under surface 



smooth, lighter colored, in fresh specimens surrounded by a 



brown band, but without the marginal spiral striae of the last 



species, umbilical funnel striated, periphery blade-like, only 



11 



