PLATE 23. 



CUBOSPH^EKIDA. 



Diam. Page 

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



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



Fig. 3. Hexancistra mirabilis, n. sp. ( = Hexapitys rnirabilis), . . x 400 189 



The spherical central capsule encloses the concentric spherical inner shell 

 (which is filled 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 xanthellae. 



Fig. 4. Hexacaryvm arbor escens, n. sp., . . . x 400 203 



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



