CEPHALOPODA. 



Ffcr. 2. 



11 



The Common Cuttlefish (Sepia officinalis), and its shell or bone (a). 





The Spirula (Spirula peroiiii). (From the Indian and Pacific Oceans.) 



1. Animal: a, portions of the shell exposed in front and behind; b, the 

 funnel or siphuucle. 2. Side view of shell. 3. Shell in section, to 

 show partitions or septa. 



