JTL 



u 



FIG. 8. Atlanta Peronii (after Gegenbaur). a, Pliavynx ; 6, buccal ganglion ; c, tentacle ; d, 

 eye ; e, cerebral ganglion ; /, aorta cephalica ; g, pleuro-visceral connective ; h, columellar muscle ; 

 i, k, osphradimn ; I, vagina ; in, ctenidium ; n, anus ; o, uterus ; p, nephridium ; q, aorta cephalica ; 

 r, auricle ; s, ventricle ; t, aorta visceralis ; n, digestive gland (liver) ; v, ovary ; w, stomach ; x, 

 pedal ganglion ; y, operculum ; z, metapodium ; 1, sucker of the fin-like foot (rudimentary sole) ; 2, 

 foot ; 3, auditory organ ; 4, oesophagus ; 5, snout ; 6, salivary gland. 



FIG. 9. Pterotrachea (Firola) coronata (after Leuckart). a, Pharynx ; 6, proboscidal snout ; 

 c, eye ; d, cerebral ganglion ; e, pedal ganglion ; /, pedal artery ; g, intestinal canal ; h, pleuro- 

 visceral connective ; i, pnrieto-visceral ganglion ; fr, osphradimn ; ?, ventricle ; in, auricle ; n, 

 anus ; o, ctenidium ; p, metapodium ; g, appendage ; r, aorta cephalica ; s, nerve running to the 

 metapodium ; t, artery ; u, foot ; v, common pedal artery ; w, cephalic artery ; x, auditory organ ; 

 y, buccal ganglion. 



