NORWEGIAN OPISTHOßRANCHIATE MOLLUSCA 



15 



of the liver diverticulum by gradually becoming lined with 

 liver cells. 



Every portion of the liver is divided into smaller lobes which 

 together give a compact aspect. JMovvhere do these penetrate the 

 ayer of connective tissue that covers the body; and there are 

 no liver diverticula in the papillae, which project on the back 



H 



vJ9 



Fig. 7. Nervous system of G. typica (cf. p. 46). 



as homogenous processes from its cutis (cf. Odhner 1907, 

 fig. 1, p. 99). 



The stomach as well as the large dorsal liver diverticulum, 

 and the posterior large liver duct, were filled with masses of 

 nutritive matter, evidently of animal origin, though of indeter- 

 minable kind. 



Nervous System. 



The main feature of the central ganglia is their concen- 

 trated position especially the shortness of the pedal commissure. 

 All ganglia are spheroid in shape, without any projecting lobes; 



