280 



GASTEROPODA. 



the ornaments of our chimneypieces, and the gems 

 of our cabinets, are of very peculiar structure. In 

 the earlier period of their growth they much re- 



FIG. 217. TIGER COWRY (Cyprrra Hgris}, HARP (Harpa, ventricosa), AND 

 CLOTH-OF-GOLI> CONE {Conus textilis). 



semble the Cones mentioned above ; but when they 

 have arrived at a certain size, the mantle of the 

 contained Mollusk spreads over tlie entire external 

 surface and covers it with a porcellanous coat quite 



FlG. 218. YOUNG COWRIE. 



FlG. 219. MONEY COWRIE, ADULT. 



different in colour from the original shell, and this, 

 joined to the changed appearance of the opening, 

 might cause the adult to be mistaken for a different 

 sDecies. 



