166 SPECIFIC 



Lister Conch, tab. 1020. fig. 23. 



Shell brownish white, aperture white, polished; 

 whorls rounded, plaited on the upper margin, se- 

 parated by a groove, lower ones nearly smooth ; 

 beak short. 



Inhabits India. 



PLATE XIX. 



Fig. 1. Trochus perspectivus. 



Shell convex, obtuse, margined ; umbilicus per- 

 vious, crenulate. 



Lister Conch, tab. 636. fig. 24. 



Specimen white, with ochraceous spots on the 

 margin and suture of the whorls 5 umbilicus fian- 

 nel-shaped, surrounded by a spiral crenate margin ; 

 shell flat underneath, longitudinally and trans- 

 versely striate 5 acute margin of the whorls formed 

 of a triple belt. 



Inhabits the shores of Asia and Africa. 



Fig. 2. T. Zizyphlnus, 



Shell conical, smooth ; whorls margined. 



Lister Conch, tab, 616. fig. 1. 



