PLATE XXXV. 



PAGE 



Ilycdoneina {Stylocabjx) depressum, F. E. S., . . 217 



Fig. 1. A specimen, preserved iu alcohol ; natural size. 



Fig. 2. Longitudinal section through the body and the basal tuft ; natural size. 



Fig. 3. Fragment of the outer part ; x 60. 



Fig. 4. Great amphidisc ; x 200. 



Figs. 5, 6. Autogastral pentact pinuli ; x 300. 



Fig. 7. Autodermal pentact pinulus ; x 500. 



Fig. 8. Tetract with echinated ends from the basal annular pad of the body ; 

 xlOO. 



Fig. 9. Fragment of the parenchyma, with different parenchymal spicules ; 

 x200. 



Fig. 10. Fragment of the parenchyma, with oxyhexacts and small amphidiscs ; 

 This plate was arranged by Sir Wyville Thomson. 



x500. 



