PLATE XVIII. 



Illustrating paper of N. E. Harrington, pp. 214-222. Drawn by the author. 



Fig. 1, 2, 3, 4, 5. Parapodia 1st, 10th, 20th, 30th and 50th somites of K. 

 cychtrus, adult, epitocous Heteronereis form. Fig. 5. shows modified sexual 

 form of parapodium with accessory respiratory lobes on ventral cirrus and 

 neuropodium. All these appendages are distended with eggs even to the 

 tips of lobes. Two ova are shown for relative size at side of Figure 5. 



