EXPLANATION OF PLATE XL1. 



Halodora, sp. incert. 

 Fig. 56. The middle region of a jointed chseta ( X 300). 



X/uitronereis australiensis, M'lntosh. 



Fig. 58. The head, dorsal view (enlarged). 



Fig. 5!). Head. doi>al view (more enlarged), with the 

 peristomial nap turned back to show the slit-like 

 entrance to the nuchal organ on each side. 



Fig. 00. Head, ventral view (enlarged). 



Fig. 01. Six segments (/ 4), with the parapodia of one 

 side ; the dorsal cirrus on the penultimate segment 

 has been cut across to show the characteristic flat- 

 tening in this species. 



Fig. 02. The 30th parapodium ( 20). 

 Fig. 03. A sub-acicular chseta from the 30th parapodium 

 (X 250). 



Fig. 04. A sub-acicular ehteta from the 10th parapodium 



( 250). 



Fig. 05. The upper series of jawlets of the right side, as 

 seen in situ ( > 20). 



Fig. 00. Isolated jawlets (> 35), <i. a group of jawlets of 

 the outer and inner series : b, one of the jawlets 

 of the inner series ; c, anterior jawlets of the inner 

 series ; d, a triangular piece which rests on the 

 ba.se of the outer and inner series. 



Eunice bassensis, M'lntosh. 

 Fig. 07. The head from the side (/ 8). 



Fig. 08. The anterior end ( 8) ; the tentacles of the right 

 side and the parapodia of the left have been omitted. 



Fig. 0!). A segment from the side (> 8) to show the rela- 

 tively small size of the gill at its maximum develop- 

 ment. 



Fig. 70. The twelfth parapodium (/ 20), from a well 



preserved specimen. (Cf. fig. 78). 

 Fig. 71. A cha'ta from the 40th parapodiuin ( 300). 



Fig. 72. The tip of an acicular cha-ta from the 40th foot 

 ( . 250) ; it is bidentate, and the wings are present. 



Fig. 73. A tridentate acicular chseta from a posterior foot 

 (> 250). The wings are omitted. 



Fig. 74. A tridentate acicular clueta from the 53rd foot 

 (X 250), the wings are omitted. 



