MOLLUSCA. 



85 



Zool., 1872 ; Quenstedt, Die Cephalopoden, 1846 ; Barrande, Cephalopodes, 

 in ' Systeme Silurien du Centre de la Boheme,' 1872-77.) 



Fig. 76. Cephalopoda. Sepia ekgans. 



Fig. 77. Anatomy of Spir- 

 ula australis (after Owen), 

 showing the position of the 

 skeleton. 



