Plate 5. 



Fig. 1. Caulophacus schidzei. Spinose discohexact with some bifid rays (Discohemi- 



hexdsfer of Schulze) ; x 250. 



" 2. " " Discohexaster; a complete ray showing lateral branches ; 



x250. 

 3. " " Discohexaster ; x 250. 



4 " " Spinose discohemihexaster that nearly reaches condition 



of perfect discohexaster ; x 250. 

 5. " " Si)inose discohemihexaster ; centrnm and one principal 



ray with its branches ; x 250. 

 G. " " Discohexaster; centrum and one complete ray; x 250. 



7. Caidujjhacu.s, sp. Stalk attached to root spicules of Hyalonema. From a photo- 

 graph ; \. 



8. Caulojjliacus schu/^cL Discohexaster; a complete ray, showing asymmetrical 



base on which tlie terminals rest ; x 250. 



9. " " Spinose discohemihexaster; x 250. 



10. " " Radial .section through body showing skeletal arrange- 

 ment. Thickness of section permits only larger spaces 

 to be seen. Gastral surface uppermost ; x 20. 



11. Bafhi/ilonts //tIs spumsKs. From a photograph ; {. 



12. " " " Oxyhexaster; x 300. 



13. " " " Stauracts ; x 300. 



