PLATE 18. 



LlOSPH^RIDA et ASTROSPH^RIDA. 



Diam. Page 



Fig. 1. Centrocubus cladostylus, n. sp., . . x 100 278 



Fig. 2. OctodendroH sputhillatum, n. sp., . . x 300 280 



The entire inner shell, but a small part only of the outer shell is represented. 



Fig. 3. Octodendron cubocentron, n. sp., . . x 400 279 



The central capsule (somewhat irregular by compression ?) exhibits a large 

 excentric nucleus (probably dislocated artificially 1). 



Fig. 4. Octodendron spathillatum, n. sp., . . . x 800 280 



Free distal end of a radial spine, with the spathillse on the end of the 

 branches. 



Fig. 5. 1th i-.ux i >hrn-(i wrmta, n. sp., . . x 300 284 



Fig. ('. Rhizosphcem serrata, n. sp., . . . . x 300 284 



Medullary shell. 



Fig. 7. Rhizosphcem wrrata, n. sp., . . x 600 284 



A single radial spine. 



Fig. 8. Pkfjmosphcera exodictyon, n. sp., . . . x 200 89 



The central shell-cavity encloses the spherical central capsule and the con- 

 centric nucleus. 



Fig. 9. Sponyodi'ymus elaphococcus, n. sp., . . x 150 272 



The entire inner shell but only a small part of the outer spongy envelope is 

 represented. 



