EXPLANATION OF PLATE XVII. 



FIGURE 86. Potamilla oculifera, (p. 617 ;) in its tube, with branchiae fully expanded, 



from a living specimen, found at Eastport, Maine. 

 87. Cistenides Gouldii, (p. 612 ;) lateral view. 

 87 a. The same ; head and branchiae, dorsal view. 



88. Sabellaria vulgaris, (p. 611 ;) lateral view. 

 88a. The same ; view of the operculi 



lum and tentacles, from above. 

 (Figures 84, 88, 88 were drawn from nature, by J. H. Emerton ; 87, 87a by A. E. Yerrill.) 



