PLATE XVI. 



Illnstratiiig the paper of N. R. Harrington, pp. 214-222. 



Fig. 1. Eupagurus ahtsk-ensis (Benedict), with commensal Nereis cydiirus 

 n. sp., inhabiting iM?irt?/a shell. 



Fig. 2. Lower coils of Lunaiia shell, inhabited by hermit-crab, broken 

 away, showing Nereis cyclurus in its normal retreat. 



Fig. 3. Head and anterior somites of Nereis cyclurus n. sp. This drawing 

 was made by Mr. J. H. McGregor. Figures 1 and 2 are reproduced from 

 photographs. 





