104 



Fig. 7?. Buccal bulb from left side. The sub- 

 oesophageal ganglion and its branches (a — g), 

 and the buccal nerve are shown. x 1. 



Fig. 79. Longitudinal median vertical section of arm, 

 showing brachial artery and nerve, nerve 

 ganglia corresponding to the suckers, and net- 

 work of fine arteries and veins which surrounds 

 them. x 1. 



Fig. 80. Dissection of dorsal surface of head, showing 

 the circular nerve which unites the brachial 

 nerves, at the bases of the arms. x A. 



Plate IX. 



Fig. 69. Ventral dissection of nervous system, partly 

 diagrammatic. Funnel cut open and turned 

 aside, muscular septum removed ; the branches 

 from ganglia on visceral nerves are shown 

 only on the right side. x |. 



Fig. 70. Central nervous system, from left side. Slightly 

 enlarged. 



Fig. 71. Left optic ganglion and nerve from dorsal 

 surface. x 1. 



Fig. 73. Dissection of gastric ganglion and its branches 

 (a — h). The alimentary canal is seen from 

 the ventral surface. 



Fig. 74. Dissection of the superior ophthalmic nerves, 

 and the olfactory nerves from the dorsal 

 surface. The skin and superficial muscles 

 have been dissected away and turned back, 

 showing the muscular coat of the eye, the 

 bases of the arms, and the muscles covering 



the cranial cartilage. x 



Fig. 75. Lateral view of right eye, after dissecting away 

 the superficial muscles and skin. Shows 

 anterior superior and inferior ophthalmic 

 nerves. x i. 



Fig. 76. Buccal mass and central nervous system, dorsal 

 view. The course of the labial (a — d) and 

 buccal nerves may be seen. x 1. 



