EXPLANATION OF PLATE XXIII. 

 Lophocalyx spinosa. F. E. Sell. 



Fig. i. Oblique, lateral view of a specimen, Nat. size. 



Fig. 2, A specimen seen from above, Nat, size. 



Fig, 3, Arrangement of the spicules in a transverse section of the bodj- 

 wall, vertical to the surface. x -J^ (combined figure). 



Fig. 4. Autodermal pentactine. x 300. 



Fig. 5. Surface- view of an autodermal stauractine. x 300. 



Fio-. 6. Oblique view of an autodermal stauractine. x 300, 



Fify, 7. Lateral view of an autodermal stauractine. x 300, 



Fig, 8, Autogastral hexactine. x 300. 



Figs. 9-1 1. Hemioxyhexasters. x 300. 



Fig. 12. Strobilo-plumicom. x 300. 



Fig. 18. Schematic longitudinal section of a braach-ray-group of a strobilo- 

 plumicom. X 500. 



Fiof. 11. Lower end of a tetradentate basal anchor-spicule. x 200, 



Fiffs. 15 and 16. Eads of two macrosclere, parenchymal diactines. x 200. 



