I. IJIIIA. 



STUDIES ON THE HEXACTINELLIDA. CONTRIBUTION III. 



PLATE III. 



Leucopsacus ortliodocus Ij. 

 Leiicopsacus scoliodociis Ij. 



This plate also contains fignres (1-13) taken from two small specimens of Staumcahjplus 

 sp., not specifically determinal)le with certainty on acconnt of their yonnsj state. Both are 

 from the Sagami Sea. References to these figures will be made in a future Contribution 

 relating to the Rossellidfe. 



Figs. 1-6. Young Staurocalyptus sp. (Sei. Coll. Mas. Sp. No. 437). 



Fig. 1. Spicules of dermal suvfiice, seen from outside. 100 x . 



Fig. 2. S[)ictiles of gastral surface, seen from inside. 100 x . 



Figs. 3, 4. Common oxyhexasters, 300 x . 



Fig. b. Microdiscohexaster. 300 x . 



Fig. G. Portion of a discoctaster. 300 x . 



Figs. 7-13. Young Staurocalyptus sp. 



Fig. 7. Surface-view of dermal layer. 30 x . 



Fig. 8. Combination figure of spiculation of the wall. 30 x . 



Fig, 9. Entire specimen. 2 x . 



Fig. 10, 11. Deformed discoctasters. .300 x. 



Fig. 12, 13. Oxyhexasters. 300 x . 



