121 BeauHful SJtclls. 



sometimes found on our own sliores, wlicre also may. 

 be obtained the Common Sepiola^ S. vulgaris, 

 usually about three inches long, and tlie Officinal 

 Cuttle-fisli, S. officinalis, wliicli is about a foot in 

 length ; we give below small figures of each of these 

 three species, to show the difference in the shape : 

 the two last, it will be observed, have, in addition 

 to the eight tentacles, which give the generic 

 name Octopus, signifying eight, two long side arms, 

 the use of which docs not appear to be very clearly 

 determined. 



NAUTILUS AND AMMONITE. 



The Nautili are called testaceous ccphalopods ; 

 our readers know, or ought to know, the meaning 

 of both these terms. Like the Cuttle-fish, they arc 

 sometimes called Pohjpi, because they have many 

 arms or tentacles, the word i^ohj, with which a great 

 number of English words commence, being the 

 Greek for many. An ancient writer named Aris- 

 totle, after describing the naked cephalopods, says, 

 ^^ There are also two polypi in shells ; one is called 

 by some, oiautilus, and by others, nauticus. It is 

 like the polypus, but its shell resembles a hoUow 



