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. 
Liste?‘ 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 ; 
