nep. 



al.c. 



d.v. 



■gen.op. 



St. intjd. 



'•?• Pf- P*- ect 



mt. 



Fig. 1 68. 



an. 



Fig. 167. 



Fig. 167. Diagrammatic dorsal view of nemertine. From Kukenthal. al.c. 

 alimentary canal; an. anus; brn. cerebral ganglia; c.o. cerebral organ; c.v. 

 connecting and d.v. dorsal vessel; e. eye; gen. op. genital openings; l.v. 

 lateral vessel l.n. lateral nerve; M. mouth; nep excretory system and np.o. 

 one of its pores ; pb. proboscis in the rhynchocoel. 



Fig. 168. A, Longitudinal vertical section of a metanemertine to show the 

 relation of the various cavities. After Benham. brn. cerebral ganglia; int. 

 intestine ; int.d. coecum ; pb. proboscis ; pb.' solid non-eversible part of the 

 former, attached to the proboscis sheath and acting as a retractor muscle ; 

 ps. proboscis sheath ; re. rhynchocoel ; rh. rhynchodaeum ; std. stomodaeum ; 

 St. stomach. B, Transverse section of a palaeonemertine, passing through a 

 pouch of the intestine on the right and an ovary on the left. After Coe. 

 ect. ectoderm; l.v. lateral blood vessel; l.n. lateral nerve; m.c. circular 

 muscles; m.l. longitudinal muscles; ov. ovary; p.al. pouch of intestine; 

 par. parenchyma. Other letters as above. C, Proboscis of a metanemertine 

 to show the diaphragm and the stylets sy. and sy.' After Bresslau. 



