66. 



pm. Pallial muscles, 

 pn. Palp norve. 



r. Pouch leading to the cerebral ganglia, 

 rl , Uight liver lobe. 

 s , She 1 1 . 



st , Siphonal tentacle, 

 std. Stomodaeum. 

 sto. Stomach. 

 t. Test, 

 tn. Tentacle nerve, 

 ubs. Upper blood space. 

 ulm. Upper longitudinal nuscle, 

 vg. Visceral ganglia. 

 X, Depression at the point where the cerebral ganglia 



are formed, 

 y. Cut wall of gill plate. 

 Z. Large cells that appear when the liver is forced into 



the space dorsal to the intestine. 



EXPLAMTION OP PIGUEES. 



Pig. 1. Expanded adult specimen, seen from the right side. 



