DESCRIPTION. 155 



shell flat underneath, longitudinally and trans- 

 versely striate ; acute margin of the whorls formed 

 of a triple belt. 



Inhabits the shores of Asia and Africa. 



Fig. 2. T. Zizyplunus. 



Shell conical, smooth ; whorls margined. 



Lister Conch. Tab. 616. Fig. 1. 



Specimen livid, with red indistinctly waved rays 

 and spots upon the margin ; transversely striate ; 

 whorls contiguous, upper ones finely granulate : 

 aperture pearly. 



Inhabits the European and African seas. 



Fig. 3. T. dolabratus. 



Shell umbilicate, glabrous ; columella recurved, 

 twisted and plaited. 



Lister Conch. Tab. 844. Fig. 72. 



Shell white, with purplish brown transverse lines; 

 whorls somewhat rounded, separated by a groove ; 

 columella with three folds. 



Inhabits South America. 



Fig. 4. Turbo murkatus. 



Shell umbilicate, subovate, acute, surrounded 



