Clark. — l’uget Sound Kchinoderms. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 10. 
Fig. 17. 
Fig. 18. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
Fig. 22. 
Fig. 23. 
Fig. 24. 
Fig. 25. 
Fig. 26. 
Fig. 27. 
Fig. 28. 
PLATE 4. 
(Jribrella spiculifera. — Three adambulacral plates, showing the ar¬ 
mature. X 5. 
Figs. 2-4. Dermasterias imbricata (Grube). 
Eight adambulacral plates, from near tip of ray, showing the two rows 
of spines. X 5. 
Four adambulacral plates from near base of ray, showing the spines and 
the fleshy ridge. X 5. 
Calcareous spicules from the membrane of the abactinal surface. X 78. 
(?) Synapta albicans Sel.—Miliary granules from the longitudinal 
muscles. X 310. 
Figs. 0-10. Psolus clutonoidefi sp. nov. 
Interradial and radial pieces of calcareous ring. X 3. 
Supporting rods from tentacles. X 78. 
Supporting rods from tips of tentacle branches. X 78. 
Supporting plates from pedicels. X 78. 
Perforated plate and incomplete table from sole. X 78. 
Figs. 11-20. Cucumaria chronhjelmi Tlieel. 
Supporting rods from tentacles. X 78. 
Supporting plates from pedicels. X 78. 
Radial piece of calcareous ring, x 5. 
Interradial piece of same. X 5. 
Large plates from body wall. X 78. 
Common knobbed button. X 78. 
Reticulated basket or cup, seen from below. X 310. 
Basket with spire, seen from the side. X 310. 
Small branch of the respiratory tree. X 5. 
Band of skin from middle of body, laid flat to show the arrangement 
of pedicels. Nat. size. 
Figs. 21-28. Cucumaria lubrica sp. nov. 
Band of skin from middle of body, laid flat to show the arrangement 
of pedicels. Nat. size. 
Interradial and radial pieces of calcareous ring, x 5. 
Supporting rod of tentacle. X 78. 
Supporting rods from pedicels. X 78. 
Perforated plates from body walls. X 78. 
Common perforated ellipse or button. X 78. 
Same, seen from one side. X 78. 
Branch of the respiratory tree, to show the difference in shape of the 
branches in lubrica and other holothurians, as illustrated by C. 
chronhjelmi , fig. 19. X 5. 
