B. W. PRIEST ON THE HEXACTINELLlD^. 15 



8. — Ditto of Labaria. 



9. — Ditto of Euplectella. 

 10, 11 & 12. — Flesh spicules of Evplectella. 

 12a. — Floricomo spicule of Euplectella. 

 1 2b. — Claw-shaped end of Kay of ditto. 

 13 & 14. — Scopuliue spicules occurring in Aphrocallistes. 



Plate III. 



Fig. l.—Eossella Phillippinensis. 



2, 3, 4, 5, 6, 7, 8, 9. — Some of the spicules of the same. 

 10. — Lattice-like framework of Farrea occa. 

 11. — Fragment of Farrea occa, enclosing a scopuline spicule (after 



Carter). 

 12. — Portion of skeleton framework of Aphrocallistes Beatris. 

 13. — Portion of the outer wall of a Yentriculite showing the 

 octohedral structure of the silicious network. 



Note. — In all the flesh spicules figured, the third axis, comprising the 

 fifth and sixth rays, is omitted, in order to avoid complicating the drawing. 



