EXPLANATION OF PLATE XLVI. 



Nereis arenaceodentata, Moore. 



Fig. 1. — Head (x 8). The peristomial cirri are removed 

 from the left side of the figure. 



Fig. 2. — The fifteenth i^arapodium ( X 35). The chsetse are 

 omitted. 



Fig. 3. — A sub-acicular chseta from the neuropodium 



(X 720). 



Ceratonereis falcaria, Willey. 



Fig. 4. — Head ( X 40). Camera outline. 



Fig. 5. — The thirteenth parapodium (x 70). 



Fig. 6. — A parapodium posterior to the 21st segment with 

 the characteristic dorsal chsetae ( x 70). 



Eig. 7. — A notopodial chseta from an anterior segment 



(X 720). 

 Fig. 8. — A notopodial chseta from the 22nd and subsequent 



segments (x 720). 



Fig. •). — A neuropodial chseta ( X 720). 



Fig. 10. — The maxillary region of the pharynx (enlarged). 

 Cheilonereis peristomialis, sp. nov. 



Fig. 11. — Head from the side (x 4) drawn from a specimen 



from New Zealand in which the peristomial lip is 



fully spread out. 

 Fig. 12. — A sub-acicular < hseta from the neuropodium 



(X 250). 

 Fig. 13. — A supra-aciciilar chseta from the neuropodium 



(X 250). 



Fig. 14. — The second parapodium ( x 10). 



Fig. 15. — The third parapodium (x 10). 



Fig. 16. — The ninth parapodium (x 10). The lamella is 

 commencing to develop. 



Fig. 17. — The twentieth parapodium (x 10). 



Fig. 18.— The thirty-fifth parapodium (xlO). The dorsal 

 lamella and the dorsal ligule are now at their maxi- 

 mum development. 



