SEA MUSSEL MYTILUS EDULIS. 



173 



PDPN » PN 9° 



P ov 



SN~ 



PVPN--1 



Fig. 160.— View of labial palp in transparent preparation. Fixed in strong Flemming fluid, exposed in 70 per cent alcohol 

 to strong sunlight, dehydrated, and cleared in benzol and oil of wintergreen. BuX, buccal nerve and its branches which run 

 between the ridges. 



Fig. 161.— Posterior view of the area surrounding the syphonal region showing the innervation of the anal syphon. Prepara- 

 tion same as fig. 160. AM. anal membrance; ExS. exhalent syphon; IFM inner fold of the mantle; InS. inhalent syphon; OFM, 

 outer fold of the mantle; PVPN, posterior ventral pallial nerve; SN , sypnonal nerve. 



Fig. 162.— Lateral view of mussel with shell removed showing distribution of genital canals and pallial nerves. APN. 

 anterior pallial nerve; DPX. dorsal pallial nerve; GC. genital canal; GO, position of the genital opening on the ventral wall inside 

 the mantle; L, liver; OV, oblique vein; P pericardium. PDPN. posterior dorsal pallial nerve; PS. pallial nerve; rest asin fig. 161. 



90392°— 22 4 



