BELEMNITES. 



361 



max 



internal coiled sLell. The shells of Spirula Peronii La- 

 L-ck are rarely thrown ashore on Nantucket ; it lives upon 



Fi" 217 —Pearly Naoolus, N. poinpilviis. Seen in section showing 

 the chamoera and siphnncle. Half natural size.— From Tenney's Zo- 

 ology. 



the high seas. The extinct Belemnites had, like the recent 

 Moroteuthu Verrill, a straight conical shel), the " thunder- 



Pig. — Ponlpe 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 



