270 POPULAR CONCHOLOGY. 



attached to,) the body of the animal ; spire bica- 

 rinated, tubercled, and curved back into the 



mouth. Animal having eight tentacula; two 

 of which are thin and dilated, and are often 

 called the sails. — 3 species, recent. 



These curious and beautiful shells are found 

 in the seas of warm latitudes, and are both pe- 

 lagic and lit oral.* They are commonly called 

 the Paper Nautilus. 



An interesting series of experiments was 

 made a few years ago by Madame Power, for the 

 purpose of ascertaining the nature and habits 

 of the Argonauta, about which much contro- 



* Penny Cyclopaedia, art. Paper Nautilus. 



