464 THE ANATOMY OF INVERTEBRATED ANIMALS. 



ized soft parts are retained, show that the arms were pro- 

 vided with hooks, and that there was a large ink-bag. 1 



Fig. 134. — Belemnite*. with the remains of the body of the animal. (From a 

 specimen in the Museum of Practical Geology.)— a, arms with hooks ; b, head; 

 c, ink-hag; d, phragmocone ; <?, guard. 



1 Huxley, " The Structure of Belemnites." (" Memoirs of the Geological 

 Survey of the United Kingdom," 1864.) 



