PLATE LXV. 



PAGE 



Rhabdocalyptus roeperi, F. E. S., . . . 158 



Fig. 1 . A specimen with damaged base, preserved in alcohol ; natural size. 



Fig. 2. SmaU (young ?) specimen, without basal part ; natural size. 



Fig. 3. Parenchymal spicules with eight rays and interjacent knob-like tubercles. 

 Each principal ray bears three or more slightly diverging terminals ; 

 X 300. 



Fig. 4. Small discohexaster with numerous terminal rays ; x 450. 



Fig. 5. Oxyhexaster with long, undulating, terminal rays ; x 300. 



Fig. 6. Simple oxyhexact with straight smooth rays ; x 300. 



Fig. 7. Autodermal diact with rough rays, and four central cruciate knobs; x 300. 



Fig. 8. Autodermal monact with rough ray and five central knobs, corre- 

 sponding to the aborted rays ; x 300. 



Fig. 9. Autodermal tetract with rough rays, without any trace of the two lost 

 rays ; x 300. 



Fig. 10. Gastral oxyhexact with rough rays ; x 300. 



Fig. 11. Part of a parenchymal diact, with echinated ends and four cruciate knobs; 

 x300. 



