154 SPECIFIC 



of the whorls with a double tumid line ; cleft in 

 the lip deep. 



Inhabits the Indian Ocean. 



Fig. 6. M. Vertagus. 



Shell having the upper whorls of the spire 

 plaited ; beak ascending, columella with one inter- 

 nal plait. 



Lister Conch. Tab. 1020. Fig. 23. 



Shell brownish white, aperture white, polished ; 

 whorls rounded, plaited on the upper margin, 

 separated 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 ; umbilicus fun- 

 nel-shapel, surrounded by a spiral crenate margin ; 



