PLATE 23. 



CUBOSPH^ERIDA. 



Diam. Page 

 Fig. 1. Hexadendron bipinnatum, n. sp., . . . . x 400 200 



Fig. 2. Hexacromyum octahedrum, n. sp., . . . x 400 202 



Fig. 3. Hexancistra mii-abilis, n. sp. ( = Hexapitys mirabilis), . . x 400 189 



The spherical central capsule encloses the concentric spherical inner shell 

 (which is tilled up by the nucleus), and is surrounded by the octa- 

 hedral outer shell The latter is enveloped by the octahedral calymma, 

 which is radially striated and contains numerous xanthellse. 



Fig. 4. Hexacaryum arborescens, n. sp., . . . x 400 203 



Fig. 5. Hexacontium davigerum, n. sp., . . x 300 19 



