138 



CEPHALOPODA. 



TEIBE I. DECAPODA. 



Arms eight ; tentacles two, long, slender, with 

 expanded ends ; suckers stalked ; eyes moveable 

 in their sockets ; body lengthened, with a pair of 

 side-fins ; shell loose in the mantle. 



Fins long ; shell calcareous .... Sepiada. 

 Fins short and broad ; shell horny . TeutUda. 



210 211 



FAMILY I. SEPIAD.E. 



Animal with the body broadly ovate ; tentacles 

 lengthened, broadly expanded at their tips ; side- 

 fins narrow, bordering the whole length of the 

 sides ; funnel large and short, closed with an in- 

 ternal valve. Shell (" cuttle-bone ") calcareous, 

 flat, composed of a broad plate of stony substance, 

 with a horny edge, and a sharp tip ; its concavity 



