n 



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

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

 i, k, osphradium ; I, vagina ; m, ctenidium ; n, anus ; ", uterus ; ji, nephridium ; q, aorta cephalica ; 

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

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

 foot ; 3, auditory organ ; 4, oesophagus ; "i, snout ; (*>, salivary gland. 



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

 c, rye; d, cerebral ganglion; c, pedal ganglion; /, pedal artery; <j, intestinal canal; li, pleuru- 

 visceral connective; i, parieto-visceral ganglion; 7,-, osphradium; 1, ventricle; MI, auricle; , 

 anus ; o, ctenidium ; p, metapodiuin ; ij, appendage ; /, aorta cephalica ; s, nerve running to the 

 metapodiuin ; f, artery ; , foot ; c, common pedal artery ; w, cephalic artery ; .r, auditory organ ; 

 y, buccal ganglion. 



