MARINE, LAND AND FRESH-WATER SHELLS 



Class CEPHALOPODA. 



The Cephalopods, including the Nautili, Octopoda, Cuttle-fish, etc., are 

 so-called because their long arms (called feet) are attached to the head. 

 Some of these creatures are entirely destitute of shells, others have some- 

 thing with more or less the nature and appearance of shells concealed 

 within the soft parts, others again, as the Nautilus and Argonauta, have 

 fully developed external shells. The male Argonaut is shell-less, while 

 the female has a beautiful fragile boatlike shell in which she carries her 

 eegs. 



