PLATE LXI. 



Fig. 



1. Head of Eunereis longissirna, Johnst., from St. Magnus Bay, Shetland. Enlarged. 

 la. Head and proboscis of the same from Montrose Bay. Enlarged. 



lb. Ventral patches of teeth (paragnathi) on the proboscis of la. Enlarged. 



2. Dorsal view of head and proboscis of Nereis (Alitta) virens, Sars. Enlarged under a 



lens. 

 2a. Ventral aspect of the foregoing. Enlarged. 



3. Coelomic corpuscles of this species. X 700. 



4. Contracted muscular fibril showing peculiar cross-striations. X 700. 



5. Another contracted fibril with a granular band in centre, and transparent sarco- 



lemma (b) externally. X 350. 



6. Dorsal view of head and proboscis of Nereilepas fucata, Savigny. Enlarged. 

 6a. Ventral view of the same. Enlarged. 



7. Upper dental apparatus of Staurocephalus rubrovittatus, Grube, from Herm. Seen 



from below. X about 40. 

 7a. Shorter teeth of the same, x Zeiss oc. 2, obj. D. 

 7b. Longer (outer) upper teeth. X Zeiss oc. 2, obj. D. 

 7c. Mandible of the foregoing, x 55. 



8. Mandible of Staurocephalus Kefersteini, Mel. X Zeiss oc. 2, obj. D. 



9. Dental (upper) apparatus of Staurocephalus ciliatus, Keferst., from St. Peter Port, 



Guernsey. The specimen is incomplete. X Zeiss oc. 2, obj. D. 

 9a. Mandible of the foregoing, x Zeiss oc. 2, obj. D. 

 10. Young example of Ojohryotrocha puerilis, Clap, and Mecz. Enlarged. 

 10a. Dental apparatus of the same. X Zeiss oc. 2, obj. D. Eeduced from original 



drawing. 



