PLATE XX. 



Page 

 Figs. 1-7. Porcellanaster C/ERULEUS, Wyville Thomson, . . 134 



Fig. 1. Abactinal aspect ; magnified 3 diameters. 

 Fig. 2. Actinal aspect ; magnified 3 diameters. 



Fig. 3. Profile view ; magnified 3 diameters. 



Fig. 4. A cribriform organ; magnified 10 diameters. 



Fig. 5. A portion of the abactinal surface ; magnified 20 diameters. 



Fig. G. Abactinal aspect of a young example ; magnified 3 diameters. 



Fig. 7. Actinal aspect of a young example ; magnified 3 diameters. 



