138 



CEPHALOPODA. 



Teibe I. Decapoda. 



Arms eight ; tentacles two, long, slender, witli 

 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 . . 

 Fins short and broad ; shell horny 



Sepiadae. 

 Teuthidae. 



210 



212 



Family I. Sepiad^. 



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 



