66 WALTER K. FISHER, The anatomy of Lottia gigantea Gray. 



Fig. 36. Showing the principal pedal nerves to the foot, drawn 

 only on one side, in front and rear. l l / 2 : 1. 



Fig. 37. Dissection to show labial ganglia, and subradular ganglia, 

 with their principal nerves, viewed from below. The buccal mass 

 and a portion of the lips, and palp are shown. The large protractors 

 of the buccal mass have been removed. 6:1. 



Fig. 38. A detail to show nerves to subradular organ from sub- 

 radular ganglia. The subradular organ and dorsal wall of subradular 

 pouch are drawn in. Viewed from below. 7:1. 



Fig. 39. A general view of the nerves supplying the alimentary 

 canal. The forward bend of the stomach has been removed, also the 

 rectum, and a section beyond the stomach. The remaining portions 

 have been slightly moved to give a better idea of the course of each 

 nerve. Fig. 1 will give the exact position of the loops of the canal. 

 3 : 1. 



Fig. 40. Detail of nerves to ctenidium, and those to the ureters. 

 The nerves to right ureter lie in the floor of the rectal portion of the 

 right nephridium, shown in Fig. 26. Much enlarged. 



Fig. 41. Oesophagus seen from right side, to show the nerves, 

 arising from left pleural ganglion, which supply oesophagus and a 

 portion of intestine. 



Fig. 42. A detail of ventral wall of pharynx to show the inferior 

 pharyngeal nerves, from stomatogastric ganglia. Much enlarged. 



Fig. 43. Detail of nerves to the upper lip of radula tube. This 

 lip acts as a valve closing the mouth of the radula tube. Much en- 

 larged. 



