PLATE XVII. 



Fig. 1. Calcareous plaie from the dorsal skin of Pterasler militavis ; 

 side vie\Y (Comp. Fig. 11). """/i. 



— 2. Part of section of decalcified adambulacral spine of Asterias 



panopla Stuxb., showing Ihe numerous granular (mucous?) 

 cells in the epidermis. ^^'*^/i. 



— 3 6. Calcareous plates of Phyllophonis pellucidus, Var. Barthii. 



Fig. 3. Side view. '"^^^Ii. 



— 7. Sucking disk of Phyllophonis pelliicidiis, Var. Barthii. '^'"/j. 



— 8. Section through an ampulla of Bathybiaster vexillifer, show- 



ing the great development of the muscles, ^^/i. 



— 9. Sucking disk of young Ciiciinmria fronclosa (Gunn.). ^'•^'/l. 



— 10. Calcareous plate of young Ciiciimaria frondosa (Gunn.). ^"^/i. 



— 11. Calcareous plate from the dorsal skin of Pteraster militaris 



(Comp. Fig. 1). -'^'"/i. 



— 12. Valve of straight pedicellaria of Stichaster albiihis. ^'*"/i. 



— 13. Part of the calcareous ring of a young Cuciimnria frondosa, 



10 mm long. -'^ 1. 



— 14. Tubefool of Bathybiaster vexillifer. ^"/i. 



