rOLYCH^ETA-BENHAM. 117 



EXPLANATION OF PLATES. 

 PLATE 5. 



Syllis closterobranchia (figs. 1-2). 

 Fig. 1. A parapod, anterior face( X 45). 

 2. The ends of two acicula. 



S. brachycda (fig. 3). 

 Fig. 3. Tip of aciculum. 



Spfuxrosyllis mcintoshi (figs. 4-6). 



Fig. 4. Anterior end, dorsal view ( X 45). Camera outline from a specimen mounted 

 in glycerine. 



5. Ventral view of the same ( X 45). 



6. The tips of acicula. 



Autdytus cJiarcoti (figs. 7-10). 



Fig. 7. A transverse section of the body, atokous stage, in front of the middle (camera 

 X 30). The dorsal cirri present a series of glands along the upper part of the 

 outer surface; the great ventral glandular pad is distinctly marked off from 

 the body. 



8. A chseta from the upper part of a bundle ( x 720). 



9. The " head " of Polybostrichus, ventral view (camera X 20), showing the 

 relative lengths of the appendages and the ventral swellings below the great 

 lateral tentacles. 



10. The " head" of Polybostrichus, dorsal view (X 30), showing the epaulettes 

 of the species ; some of the appendages cut short. 



Exogone anomalochceta (figs. 11-13). 

 Fig. 11. Anterior end, camera outline (x 90) ; the nuchal organ is seen on the left side. 



12. Hind end ( X 90). 



13. The three forms of chsetse in the dorsal bundle (enlarged : (a) Tip of the 

 capilliform; (b) end of the uppermost gomphotrich, side and fiont views; 

 (c) one of the remainder of the bundle, both aspects. 



Hddepidetta flynni (figs. 14-20). 



Fig. 14. Dorsal view of the head ( X 10); the palp and peristomial cirri of the right 



side are omitted. On the left side the first elytrophore is indicated. 

 15. A parapod of a cirriferous segment, posterior face (camera X 15). 



