2^2 



A IZUKA. 



Sp. t Spinning gland. 



sup. p. a. Superior parapodial artery. 



i>. c, Ventral cirrus. 



v. I. m , Ventral longitudinal muscle. 



v. ft. c, Ventral nerve-cord. 



v. v., Ventral vessel. 



Fig. 1. Semidiagrammatic section of the body of atocous individual, as 



seen from the posterior side. (20/1) 

 Fig. 2. Dorsal view of the 22nd segment, showing subcutaneous 



capillaries. (26/1). 

 Fig. 3. Anterior view of the left parapodium of the 22nd segment, show- 

 ing subcutaneous capillaries. (26/1). 

 Fig. 4. Longitudinal section of the nephridial funnel. (530/1) 

 Fig. 5. Cross-section of the post-septal canal of a segmental organ 

 (530/1). 



Fig. 6. Blood corpuscles in lateral view. 



Fig. 7. Haemin crystals prepared from the blood (530/1). 



Fig. 8. Diagrammatic representation of the nerves proceeding from the 



brain and the anterior parts of the ventral nerve-cord and of the 



nerves supplying the proboscis in the protruded condition ; as 



seen from the dorsal side. 

 Fig. 9. Frontal section of the brain, through the origin of the Vili 



nerve. (52/1). 



Fig. 10. Another frontal section through the origin of the IX nerve. 



(52/0- 



Fig. 11. Cross-section of the ventral nerve-cord. (91/1) 



