Polychaeta.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 249 



EXPLANATION OF PLATE IX. 



Nereis attstralis. 



Fig. I. The pharynx has been slit along the ventral surface and spread open to show the arrangement 

 of the paragnaths. B, the buccal ring ; M, the maxillary ring. The compartments are 

 indicated by roman numerals. The cut muscles are represented diagrammatically. 



Lycastis quadraticeps. 



Fig. 2. The anterior end of the body. (Enlarged about 15 times.) 



Fig. 3. Ventral view of the head. (Enlarged about 15 times.) 



Fig. 4. Lateral view of the head. (Enlarged about 15 times.) 



Fig. 5. Posterior end of the body. (Enlarged about 15 times.) 



Fig. 6. A parapodium from the middle of the body. The chaetigerous lobe is withdrawn so that the 

 dorsal cirrus projects far beyond it. I, eave-like lobe of the body overhanging the base 

 of the foot. (Camera, x 40.) 



Fig. 7. A similar parapodium, in which the chaetigerous lobe is extended, and the dorsal cirrus does 

 not project beyond it. 



Fig. 8. A transverse section of the body, showing the proportion of the parapodia. The thick section, 

 cut by hand, is a little distorted dorsally. (Camera, x 25.) 



Fig. 9. A falcate heterogomph. (Camera, x 500.) 



Fig. 10. A posterior parapodium. ( x 40.) 



