Plate VIII. 



lîegadrclla okinoaeana Ij. 



Fig. ]3. Large liexactiii-dermalia (prostalia marginalia) from the cuff-edge. 



Ehapliides adhering to the distal ray. 150 x . 

 Figs. 14-18. Hexactin-dermalia of varions sizes from the ledge. 150 x . 

 Figs. 19-20. Oxyhexasters. 300 x . 

 Fig. 21. Oxystauraster seen from side. 300 x . 

 Fig. 22. Same seen flat on. 300 x . 

 Fig. 23. Floricome. 300 x . 



Figs. 24-26. Intermedial microxyhexactins with spinose rays. 300 x . 

 Figs. 27-28. Occasional intermedial spicules (canalaria ?). 150 x . 

 Fig. 29, Section of the edge of a parietal ledge. 100 x . 

 Fig. 30. Trabecultü, with thesocytes (ih.). 440 x . 

 Fig. 31. Portion of sieve-plate beam, seen from dermal side. 50 x . 

 Figs. 32-36. Some spicules shaken out from the dead skeleton shown in 



PI. Vir, fig. 3. — Fig. 32, spinose microxyhexactin (300 x ). Fig. 33, 



rare form of an intermedial hexactin (basidictyonalia ?) (150 x ). 



Fig. 34, basidictyonal hexactin (150 x ). Fig. 35, oxystauraster 



(300 X ). Fig. 36, remnant of a graphiocome after loss of terminals 



(300 X ). 

 Fig. 37. Portion of oscular membrane, with spinose siüculcs which grade over 



into microxyhexactins. From a small and rather young specimen. 



100 X. 



