156 VASIDiE. 



columella with several transverse folds in the middle; 

 outer lip thickened and sinuous. 



Syn. Cynodona, Schum. Clava, Fabr. Scolymus, 

 Swains. Volutella, Perry, not Sivains. or D'Orh. 



Ex. V. cornigerum, Linn<Bus, pi. 17, fig. 1. Oper- 

 culum, V. cornigerum, fig. 1, «, 1, h. Shell, V. corni- 

 gerum, fig. 1, c. 



The animal is slow-moving, timid, and inactive, shrink- 

 ing quickly within the shell on the slightest alarm ; the 

 operculum is very thick, claw-like, and partially free at 

 the hind part. The species of this genus are not very 

 numerous, and are confined to the tropics, being found in 

 the East and West Indies and in the Pacific Islands. 



Species of Vasum. 



armatum, Brod. cornigerum, Litm. 



caestus, Brod. globulus, Reeve. 



capitellum, Linn. imperiale. Reeve. 



cassidiforme, Reeve. muricatum, Born. 



Ceramicum, Limi. rhinoceros, Chem. 



Genus Mazza, Klein. 



Shell thick, obconic, smooth, last whorl large; spire 

 obtuse, apex papillary; aperture oblong, narrow; canal 

 long and straight; columella with several strong trans- 

 verse plaits in the middle; outer lip thin, simple. 



Syn. Xancus, Bolten. Rajpum, Humj^h. Turbinellus, 

 Lat??. 



Ex. M. pyrum, Linnams, pi. 17, fig. 2. 



The species of this genus are few in number, and the 



