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 tlie 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. caperafa, Petit (non 

 Pbil.), and X. cribpa^ Martens (non Konig). 



X. CONCHYLIOPHORUS, Born. PI, 46, fig. 89. 



Light brown, rugosel}' 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, Born, X. agglulinans, Lam., X onustus, 

 Reeve, X. meandrina, X. vulcania, X. tricostata, and X laevi- 

 gata^ Fischer de "Waldh.jCtc. 



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



X. DiGiTATA, Martens (unfigured). West Africa. 



X. Cavelieri, Rochebrune (unfigured). Senegamhia. 



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, obliquely undulatel}^ striated and grooved ; under 

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

 rugose revolving striie, umbilical funnel closelj' striated ; yel- 

 lowish or orange-brown, lighter colored beneath. 



Diam. 2-15 inches. 



China. 

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



Finely obliquely striated, j-ellowish 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 



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