PLATE XC. 



Fig. 



1. Dorsal view of Ferine foliosa, Sars, from St. Andrews. In this example reproduc- 



tion of the posterior region had taken place, as indicated by the larger branchige 

 in front. Enlarged. 



2. Nerine cirratuhos, Delle Chiaje, from Guernsey. Enlarged. 



3. Dorsal view of Scolecolepis vulgaris, Johnston, from St. Andrews. Enlarged. 



4. Cephalic region and tentacles of the same. Enlarged. 



5. Foot and gill of the foregoing seen from the front in life. Enlarged. 



6. Magelona papillicomis, Fritz Miiller, from St. Andrews. Enlarged. 



