Clark. — The Starfishes of the Genus Heliaster. 



PLATE 7. 



Figs. 1-7. Heliaster helianthus (Lamarck). 



1. Digestive system, including the intestine (IN) with its rectal gland, 

 the stomach with " blood-vessels" (?) (BV) on its abactinal sur- 

 face, the bases of the digestive glands of three rays, the ducts 

 of the other rays, and the paired stomach-muscles of the five 

 primary rays. The stone-canal (SC) may be seen between rays 

 I and V. Nat. size. 



2. A large forficiform pedicellaria. X 70. 



3. A small „ „ X 70. 



4. A forcipiform pedicellaria, from one edge. X 70. 



5. A similar „ ,, „ side. X 70. 



6. The madreporite of a large adult. X 2. 



7. ,, „ ,, ,, well-grown young individual, 95 mm. in 

 diameter. X 2. 



Figs. 8-10. Heliaster kubiniji Xantus. 



8. The madreporite of an adult. X 2. 



9. Ambulacral plates from near middle of ray, seen from the outside, 



to show the scarcely quadriserial arrangement of the pedicels. 

 X5. 

 10. Ambulacral plates from near peristome, seen from the outside, to 

 show the biserial arrangement of the pedicels. X 5. 

 Fig. 11. Heliaster microbrachius Xantus. Ambulacral plates from near middle 

 of ray, seen from the outside, to show the quadriserial arrangement of 

 the pedicels. X 5. 

 Fig. 12. Heliaster polybrachius, sp. nov. Very young individual, only 40 mm. 

 in diameter. Ambulacral plates from near middle of ray, seen from 

 the outside, to show the biserial arrangement of the pedicels. X 5. 

 Fig. 13. Coscinasterias calamaria (Gray). Ambulacral plates from near peris- 

 tome, seen from the outside, to show the biserial arrangement of the 

 pedicels. X 5. 



