PLATE I 
PLATE I 
The Pearly Nautilus (Nautilus pompilius, Linn., after Owen). The 
chambered shell has been laid open down to the central plane. 
uw. The mantle. n. Hood 
b. The dorsal fold of the 0,0,0. Pedal lobes. 
mantle. p. Tentacles. 
e. Nidamental gland. s. Eye. 
~ -g. Shell muscle. x, x. Septa. 
Dette Shell siphuncle. z. Body chamber. 
~ &. Funnel: 
Frontispiece 
