IGO XENOPHORA. 



X. AusTRALis, Souverble, PI. 41, figs. 94, 95. 



Perforate, elevated conical, light ^-ellowish l)rown, obliquely 

 siiLflexuously corrugated above, profusely agglutinating; base 

 subconvex around the umbilicus and spirally sulcate, subconcave 

 and intricately rugate towards the margin, decussated by radia- 

 ting striaj, becoming subnodulous near tlie umbilicus. 



Diam.. 1 inch. 



New Caledonia. 

 X. CEREA, Reeve. PL 45, fig. 84. 



Perforate, j'ellowish white, nearly smooth, profusely aggluti- 

 nating ; base slightly concave, very minutel}' spirally and con- 

 centrically striate. Diam. 25 mill. 



Philiiqnnes. 

 X. PALLiDULA Reeve. PI. 44, fig. 79. 



Imperforate, yellowish white, obliquely striate, profusely 

 agglutinating; base subplane, thinly arcuatel}' radiatel}' striate, 

 very minutely crispate. Diam. 2'5 inches. 



Jajian. 



X. CRispA, Konig. PI. 45, fig. 85 ; PI. 46, fig. 88. 



TJmbilicated, rather thin, whitish or light yellowish brown, 

 obliquely rugate, and profusely agglutinating at the suture and 

 periphery ; base concentrically closel3^ Urate, lira about eight in 

 number, granular, the vicinity of the periphery obliquely sub- 

 radiate and granular; columellar callosity hiding a small part 

 of the umbilicus, which is profound, lamellarly plicate. 



Diam. 34 mill. 



Mediterranean Sea. 



The operculum is thin, with unilateral lines ; the earlier 

 whorls of the shell are smooth. First described under the 

 above name as an Italian tertiar}* fossil; as a living species, 

 Tiberi called it ^Y. Medilerranea. 



X. Senegalensis, Fischer. PI. 45, figs. 80, 87. 



Umbilicated, conical, rather solid, wliitish, earlier whorls 

 smooth, subsequent ones with irregular, crispate, oblique strife 

 and impressed lines, agglutinating at suture and periphery ; 

 base a little concave, concentrically granosely lirate, the liriB 5 

 or 6 in number, the lirte of the peripheral carina oblique, 



