38 



Pub. Puget Sound Biol. Sta. Vol. 2, No. 33 



ORDER PEDATA 



KEY TO GENERA 



A. Tube-feet not confined to ventral surface but in radial rows. 



CUCUMARIA (p. 38) 



AA. Tube-feet confined to ventral surface. 



B. Animals very large, 40 cm. or less ; sole-like ventral surface not 



well developed. Stichopus (p. 40) 



BB. Animals small, 5 cm. or less long; sole-like ventral surface well 



developed. Psolus (p. 41) 



Genus Cucumaria 



Body usually thick; tentacles 10; tube-feet on radii, a few often scat- 

 tered over the interradii dorsally. 



M. Bush. 



PLATE 10 



Fig. 46. Two plates from calcareous ring of Cucumaria chronhjelmi. 

 X4. 



Figs. 47, 48. Calcareous deposits from body wall of Cucumaria chron- 

 hjelmi. X 258. 



Fig. 49. Deposit from tentacle of Cucumaria chronhjelmi. X 258. 



Fig. 50. Branch of respiratory tree of Cucumaria chronhjelmi (Tj'pical 

 for Cucumaria). X 12. 



Fig. 51. Calcareous deposit from body wall of Cucumaria lubrica. X 258. 



Figs. 52,53. Calcareous deposits from tentacles of Cucumaria lubrica. 

 X 258. 



Fig. 54. Plates from calcareous ring of Cucimiaria lubrica. X 4. 



Fig. 55. Branch from respiratory tree of Cucumaria lubrica. X 12. 



