Plate VI. 



Figs. 1-8. Chcnmoplectella spinifera Ij. Pp. 71-77. 

 (All figures from Sei. Coll. Mos. Sp. No. 4.59). 



Fig. 1. The type-specimen. Natural size. 



Fig. 2. Oxypeutactiiiic dernialia with spine-bearing paratangential rays. 



100 X. 

 Fig. .3. Si)herical form of discohexaster from the peri[)hery of wall. 300 x . 

 Fig. 4. Larger spherical form of discohexaster from deep parts. 300 x . 

 Fig. 5. Discohexaster with terminals in six separate tufts. From deep 



parts. 300 x . 

 Fig. G. Discohexaster of similar form ])!it with very slender terminals. 



From deep parts. 300 x . 

 Fig. 7. Largest form of discohexaster. From deep parts. 300 x . 

 Fig. 8. Combination-figure to show the arrangement of skeletal elements 



in the [)eriphery of the wall. Above, the dermal layer. 25 x . 



Figs. 9, 10. Staurocalijptus japonic us Ij. 



Fig. 9. Sei. Coll. Mus. Sp. No. 403, seen from oscular end. Natural size. 

 Fig. 10. Same specimen in lateral view. Natural size. 



Figs. 11-17. Staurocalijptus tubulosus Ij. 

 (All figures from Sei. Coll. Mus. Sp. No. 241). 



Fig. 1!. The type specimen. Natural size. 



Fig. 12. Dermal layer seen from outside. Several dcrmalia and two hypo- 

 dermal pentactins. 100 x . 



Fig. 13. Portion of a jiaratangential ray of the prostal or hypodermal 

 pentactin, to show the character of its surfice. 303 x . 



Figs. 14, 1.5. Stauractin;c and psntactinic dermalia. 300 x. 



Fig. IG. Discoctaster from dermal side. 303 x . 



Fig. 17. Oxyhexaster. 300 x . 



