Plate 151. 

 1-4. Phryssocystis multispina A. Ag. & CI. Nat. size. 



1 . Fragment of actinal surface of test, to show primary spines. 



2. Part of abactinal surface of test, to show spines and tuberculation. 



3. Peristome. 



4. Periproct. 



5. Lovenia grisea A. Ag. & CI. Nat. size. 



5. Abactinal view of holotype (St. 4080), partly restored. 



6-8. Argopatagus planus (A. Ag. & CI.). X 2.5. 



6. Abactinal view of holotype (St. 4919). 



7. Actinal view of same. 



8. Right-side view of same. 



