Plate 5. 



Fig. 1. Caulophacus schuhei. Spinose discohexact with some bifid rays (Dlscohemi- 



hexaster of Schulze) ; x 250. 

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



X 250. 

 " 3. " " Discohexaster ; x 250. 



" 4, " " Spinose discohemihexaster that nearly reaches condition 



of perfect discohexaster ; x 250. 

 " 5. " " Spinose discohemihexaster ; centrum and one principal 



ray with its branches ; x 250. 

 Discohexaster; centrum and one complete ray; x 250. 

 Stalk attached to root spicules of Hijalonema. From a photo- 

 graph ; \. 

 Discohexaster; a complete ray, showing asymmetrical 



base on which tlie terminals rest ; x 250. 

 Spinose discohemihexaster ; x 250. 



Radial section through body showing skeletal arrange- 

 ment. Thickness of section permits only larger spaces 

 to be seen. Gastral surface uppermost ; x 20. 

 us. From a photograph ; \. 

 Oxyhexaster ; x 300. 

 Stauracts ; x 300. 



