BELEMNITES. 261 
an internal coiled skell. The shells of Spirula Peronii La- 
marck are rarely thrown ashore on Nantucket ; it lives upon 
Fig. 217.—Pearly Nautilus, WV. pompilius. Seen in section showing 
me chambers and siphunele. Half natural size.—From Tenney’s Zo- 
ology. 
the high seas. The extinct Belemnites had, like the recent 
Moroteuthis Verrill, a straight conical shell, the ‘‘ thunder- 
Fig. 218.—Poulpe or Common Octopus of Brazilian Coast. 
bolt” fossil. Allied to Loligo and Ommastrephes, are gigan- 
tic cuttle-fishes which live in mid-ocean, but whose remains 
