VANIKORO. 375 



ribbed, cancellated or spirally striated j axis perforated, 

 umbilicus ending in a distinct, arched canal behind the 

 inner lip ; inner lip simple ; aperture semilunar, more or 

 less modified by the last whorl. 



Si/n. Merria, Gray. Narica, Recluz. Nioma, Gray. 

 Leucotis, Swains. Yanicoro, Gray. 



Ex. V. cancellata, Qnoy and Gaimard, pi. 41, fig. 5, 

 5, a. Operculum, V. cancellata, fig. 5, b, 5, c. Shell, 

 V. cancellata, fig. 5, d. 



This genus was named by the Naturalists of the " Astro- 

 labe" after Vanikoro, one of the Pacific Islands, where 

 they first discovered it ; afterwards, however, they errone- 

 ously regarded it as a Sigaretus. 



Species of Vanikoro. 



acuta, Eechiz. lamellosa, D'Orh. 



Blainvilliana, Recluz. ligata, Recluz. 



cancellata, Chem. Mauritiae, Recluz. 



cidaris, Recluz. Orbignyana, Recluz. 



clathrata, Recluz. Petitiaoa, Recluz. 



Cumingiaiia, Recluz. plicata, Recluz. 



Cuvieriana, Recluz. Quoyi, Recluz. 



Deshaj'esiaim, Recluz. rosea, Recluz. 



distaus, Recluz. rugata, A. Adams. 



Gaimardi, H. and A. Adams sigaretiformis, Potiez. 



(Quoyi, A. Adams). Souleytiana, Recluz. 



granulosa, Recluz. striata, D'Orb. 



Gueriniana, Recluz. sulcata, D'Orb. 

 helicoidea, Le Guillou. 



