PLATE XLV. 



PAGE 



Pheroiiema giganteum, F. E. S., . . . 250 



Fig. 1. A specimen, preserved in alcohol ; x 0'5. 



Fig. 2. Large autodermal pentact pinulus ; x 200. 



Fig. 3. Small autodermal pentact pinulus ; x 200. 



Fig. 4. Small autocanalicular pentact pinulus ; x 200. 



Fig. 5. Large autogastral pentact pinulus ; x 200. 



Fig. G. Uncinatum-like oxydiact ; x 100. 



Fig. 7. Large amphidisc ; x 100. 



Fig. 8. Large amphidisc ; x 200. 



Fig. 9. Inferior part of an anchor-like spicule of the basal tuft ; x 25. 



Figs. 10,11. Middle part of uncinatum-like oxydiacts, from the outer wall; 

 x350. 



This plate was arranged by Sir Wyville Thomson. 



