Clark. — The Starfishes of the Genus Heliaster. 



PLATE 8. 



Diagrams to show the relative position of the five primary rays in Heliaster, 

 and the increasingly numerous accessory rays. The heavy line indicates 

 the outline of the stomach with its five pairs of muscles, which determine the 

 primary rays. 



Figs. 1-6. Heliaster kubiniji Xantus. 



1. An 8-rayed individual. 



2. A 12-rayed 



3. A 15-rayed „ 



4. A 21-rayed „ 



5. A 23-rayed 



6. A 25-rayed ,, (Note the remarkable symmetry at this stage). 

 Fig. 7. Heliaster canopus Perrier. An exceptional 27 rayed individual. 



Fig. 8. Heliaster polybrachius, sp. nov. A large o7-rayed individual. 



