Fig. 



1 



Fig. 



2 



Fig. 



3 



Fig. 



4. 



Fig. 



5. 



Explanation of Plate XVm. 



{Nereis). 



Dorsal view of anterior exti-emitj of Nereis dyanmsi n. sp. 2/1. 

 Posterior view of 50tli parax)odium of the same species in 

 atocous phase. 10/1. 

 Setose bristle of same. 220/1. 



Posterior view of 50th parapodium of the same species in 



epitocons phase. 4/1. 

 Fig. 6. Posterior view of 219th parapodium of same. 4/1. 

 Fig. 7. Paddle-shaped bristle of same. 320/1. 

 Fig. 8. Posterior view of 13th parapodium of Nereis oxypoda 



Marenzeller. 12/1. 

 Fig. 9. Posterior view of 56th parapodium of same. 12/1. 

 Fig. 10. „ „ „ 203th 



Fig. 11. Long setose bristle of same. 390/1. 

 Fig. 12. Dorsal view of proboscis of Nereis ezoensis n. sp. 5/1. 

 Fig. 13. Ventral view of same. 5/1. 



Fig. 14. Posterior view of 30th parapodium of same. 10/1. 

 Fig. 15. „ „ „ 50th 



Fig. 16. Setose bristle of same. 220/1. 

 Fig. 17. Falcate „ 

 Fig. 18. Posterior view of 30th parapodium of the same species in 



epitocous phase. 8/1. 

 Fig. 19. Posterior view of 50tli parapodium of same. 8/1. 

 Fig. 20. Paddle-shaped bristle of same. 220/1. 



