434 THE OCEAN WORLD. 
rust-coloured, marked by square brown spots. Zurbo argyrostomus, 
the Silver-mouthed Turbo (Fig. 225), is still larger, with protecting 
spines on the top of its larger spiral. Zurbo marmoratus (Linnzus), 
Fig. 224.—Turbo margaritaceus Fig. 225.—Turbo argyrostomus (Linnzus). 
(Linnzus), 
Saar 
Fig. 226.—Turbo marmoratus (Linnzeus). Fig. 227.—Turbo undulatus (Chemnitz). 
the Marbled Turbo (Fig 226), is the largest shell in the group. It is 
marbled green, white, and brown, outside, and superbly nacred within. 
The Gold-mouthed Turbo is so named from its nacre being of a rich 
golden yellow. The Wavy Turbo (Z: undulatus, Fig. 227), commonly 
