IN THE ANATOMY OF THE POLYNOINA. 355 



DESCRIPTION OF THE PLATES. 



pro, prostomium. el, elytron. 



per, peristomium. pyg, pygidiuiu. 



p, parapodium. buc. cr, buccal cirrus. 



nt, notopodium. neph, nephridial papilla. 



nr, neuropodiura. oc, eye-spots. 



cr, cirrus. 



Plate XXXIV. 



Fig. 1. Polynoe clava, ventral view. 



Fig. 2. Polynoe clava, dorsal view, elytra removed : an, anus. 



Fig. 3. Polynoe clava, dorsal view, body distended, elytra not meeting in the medio-dorsal region : 



an, anus. 

 Fig. 4. Polynoe clava, dorsal view, body not distended, elytra overlapping in the medio-dorsal region : 



an, anus. 

 Fig. 5. Polynoe clava, peristomial segment: nt. cr, notopodial cirrus; nr. cr, neuropodial cirrus ; not. set, 



group of notopodial bristles ; nt. ac, notopodial acicula. 

 Fig. 6. Polynoe clava, pygidial segment : pyg. cr, pygydial (neuropodial) cirrus ; nt. ac, pygidial 



(notopodial) acicula. 

 Fig. 7. Polynoe squamata, anterior elytron. Owing to an error on the part of the lithographer this figure 



has been turned round; the lettering ant., post., ext., and int. indicate its proper position. 



Plate XXXV. 



Figs. 8 & 9. Polynoe clava, anterior and posterior elytra respectively : at. position of attachment. 



Fig. 10. Polynoe clava, portion of elytron. 



Fig. 11. Polynoe clava, distal portion of notopodial bristle. 



Fig. 12. Polynoe squamata, distal portion of notopodial bristle. 



Figs. 12 a, 12 b, 12 c. Variations of same, all occurring in one parapodium. 



Fig. 13. Polynoe clava, distal portion of neuropodial bristle. 



Fig. 14. Polynoe squamata, distal portion of neuropodial bristle. 



Plate XXXVI. 



Fig. 15. Polynoe squamata, prostomium, showing eyes and bases of lateral and median prostomial tentacles. 



Fig. 16. Polynoe clava, prostomium, showing the same. 



Fig. 17. Polynoe clava, ventral view of two parapodia : neph, nephridial papillae, 



N.B. Figs. 1S-21 are drawn to the same scale. 



Fig. 18. Polynoe clava, nephridial papilla, showing grooves on surface. 

 Fig. 19. Polynoe squamata, the same. 

 Fig. 20. Polynoe spinifera, the same. 

 Fig. 21. Polynoe areblata, the same. 



SECOND SERIES. — ZOOLOGY, VOL. II. 50 



