286 MOLLUSC A. 



numbers in the mesozoic strata. The tentacles in the 

 belemnites had little hooks as well as suckers. The actual 

 term " belemnite " is applied usually to the fossil shell only. 

 Some of the Cephalopoda reach an enormous size, and 

 their whole organisation represents the highest point attained 

 outside the phylum of the Chordata. 



Y\g. 202. — Ammonites or Fossil Nautiloid Cephalopoda. 



[Table. 



I 



