CALMA GLAUCOIDES 466 



;j.f/., pedal ganglion ; ■•^f.g., stomatogastric ganglion ; o.g., optic ganglion ; 

 g.ojj., gastro-oesoiihageal ganglion ; rh.g., rhinophorial ganglion ; a.p.n., 

 anterior pedal nerve ; b.m.n., nerve to buccal mass ; bu.n., nerve to the 

 lips ; E., eye : g.7i., genital nerve of cerebro-pleural origin, continuing 

 beyond the genital complex as a pleural nerve ; n.c.t., nerve to cephalic 

 tentacle ; of.., otocyst ; p.c, pedal commissure ; p.p.c, parapedal com- 

 missure ; pl.n., pleural nerves, innervating the cerata and the dorsal body- 

 wall ; p.n., pedal nerves {N. no branches to the cerata from these were 

 discovered) ; rh.n., rhinophorial nerve ; s.n., nerve to salivary duct. 



Fig. 8. — Section through an interceratal space of an animal killed shortly 

 after a full meal. 



Fig. 9. — Ditto of an animal of the same size taken when the meal was 

 nearly all digested, a.v. and e.v., afferent and efferent veins of the ceras ; 

 C.S., the special cells of the ceratal connective tissue ; d., residual faecal 

 mass on the floor of the gastric sac; d.l., hepatic diverticulum; f.a. and 

 m.a., female and male acini ; h.d., sperm-oviduct ; pl.n., pleural nerve ; 

 p.n., pedal nerve ; v., median dorsal vein leading to the auricle. 



