PLATE XXIII. 



PAGE 



Figs. 1-8. Polyrhahdus oviformis, F. E. S., . . 121 



Fig. 1. A damaged specimen ; natural size. 



Fig. 2. Autogastral hexact pinulus ; x 100. 



Fig. 3. Discohexaster with short, thick, principal rays ; x 300. 



Fig. 4. Autodermal hexact pinulus ; x 100. 



Fig. 5. Principal hexact ; x 100. 



Figs. 6, 7, 8. Principal diacts with central thickening or four cruciately disposed 

 knobs, and with rough thickened ends ; x 100. 



Figs. 9-14. Balanites pipetta, F. E. S., . . . 122 



Fig. 9. A damaged specimen, preserved in alcohol ; natural size. 



Figs. 10, 11. Discohexaster with long principal and numerous short terminal rays ; 

 X 300 and 450. 



Fig. 12. Discohexaster with long principal rays and four terminals in every 

 principal ; x 300. 



Fig. 13. Autodermal hexact pinulus ; x 300. 



Fig. 14. Vertical section through the marginal portion of the specimen figured in 

 fig. 9 (combination figure) ; x 60. 



