PLATE XII. 



PAGE 



Figs. 1-7. Dictyocalyx gracilis, F. E. S., . . 105 



Fig. 1. Macerated coherent skeleton, from a photograph ; natural size. 



Fig. 2. Discohexaster with short marginal teeth on the terminal discs ; x 450. 



Fig. 3. Part of a hypodermal hexact ; x 300. 



Fig. 4. Discohexaster with long marginal teeth on the terminal discs ; x 450. 



Fig. 5. Graphiohexaster with somewhat diverging, line, raphid-like terminal 

 rays ; x 300. 



Fig. 6. Small discohexaster with many terminal rays ; x 1000. 



Fig. 7. Fragment of a floricome ; x 450. 



Figs. 8-12. Rhabdopectella tintinnus, 0. Schmidt, . . 108 



Fig. 8. Discohexaster with short marginal teeth on the bent terminal rays ; 

 X 300. 



Fig. 9. Oxyhexaster with two thin terminal rays on each principal ; x 300. 



Fig. 10. Bow-shaped spicule ; x 300. 



Fig. 11. Discohexaster with large terminal discs ; x 1000. 



Fig. 12. Oxyhexaster, in which the principals are so shortened, that the terminal 

 rays have coalesced at their base ; x 300. 



