PLATE LXIV. 



PAGE 



Ehabdocalyptus mollis, F. E. S., . . . 155 



Fig. 1. A di'ied specimen ; one- thiid natural size. 



Fig. 2. Spicules of a transverse section of the wall near the free superior margin, 

 in their natural arrangement ; x 1 5 



Fio'. 3. Plain network of the skeleton in the basal surface, in contact with the 

 supporting base; x 100. 



Fig. 4. Part of a large hypodermal pentact, with echinated rays ; x 50. 



Fig. 5. Autodermal rough diact, with four cruciate central knobs ; x 100. 



Fig. 6. Autodermal rough diact, without central node ; x 100. 



Fig. 7. Discohexaster with strong principal and long terminal rays ; x 300. 



Fio-. 8. Oxyliexact with spines or barbs at the basis of the straight rays, directed 

 obliquely inwards ; x 300. 



Fig. 9. Oxyhexact, similar to the one represented in fig. 8, with undulating rays; 

 xBOO. 



Fig. 10. A similar oxyhexact, with spirally bent rays ; x 300. 



Fig. 11. Reduced spicule with two spirally bent rays ; x 300. 



