224 MANUAL OF THE MOLLUSCA. ~ 
channelled behind; operculum subspiral (quoyia) or semi-ovyate. 
WARIS. 7. 
Distribution, 27 species. West Indies, Red Sea, Bourbon, 
India, Pacific, and Peru. 
Fessil, Miocene ? 
Small coast shells, resembling periwinkles, with whick 
Lamarck placed them. This genus is now generally placed 
among the Littorinidee. 
Macitvus, Montfort, 1810. 
Synonyms, Campulote, Guettard, 1759. Leptoconchus, Ruppell. 
Type, M. antiquus. Pl. V., Figs. 19, 20. 
Shell, when young, spiral, thin ; aperture channelled in front ; 
adult, prolonged into an irregular tube, solid behind; operculum 
lamellar. 
Distribution, 4 species. Red Sea, Mauritius. 
The magili live fixed amongst corals, and grow upwards with 
the growth of the zoophytes in which they become immersed ; 
they fill the cayity of the tube with solid shell as they advance. 
Cassis, Lam. Helmet-shell. 
Synonyms, Bezoardica, Schum. Leyenia, Gray. Cypreecassis, 
Type, ©. flammea. Pl. VI., Fig. 14. 
Shell ventricose, with irregular varices; spire 
short; aperture long, outer lip reflected, denticu- 
lated; inner lip spread over the body-whorl ; 
canal sharply recurved. Operculum small, elon- 
gated; nucleus in the middle of the straight 
inner edge (Fig. 84). Lingual teeth 3, 1, 3, as 
in’Fig. 85. 
The spiny buccal plates of Cassis have been 
Fig. 84. Opere. mistaken by Gray and Adams for the teeth, which 
of Cassis. in this genus, andalsoin 7'riton, are very minute 
and transparent. 
Fig. 85. Cassis saburon. (Original). 
Distribution, 37 species. Tropical seas; in shallow water. 
West Indies, Mediterranean, Africa, China, Japan, Australia, 
New Zealand, Pacific, Mexico. 
