Puate 11. i 
1-6. Porocidaris Cobosi A. Ag.; Station 3404. 
1. Part of denuded actinal system of specimen measuring 35 mm. in diametey. | 
2. Denuded actinal system of specimen measuring 21 mm. in diameter, 
3. Coronal plates surrounding part of the actinal system of a specimen measuring 18 mm. 
in diameter, seen from the exterior. 
A, The same as fig. 3, seen from the interior, showing the low auricles and the peculiar 
prolongations of the actinal plates. 
5. Abactinal system of a male, same as fig. 2. 
6. Abactinal system of a female, same as fig. 1. 
