CRINOIDEA 



33 



ca. 26-27, the second and third 11 joints. The outer pinnule 

 joints slender, cylindrical, smooth. Colour : pinnules yellow-red, 

 arms brown-yellow, disk light brown, cirri white. 



Eggs probably free. The Pentacrinoids may be found at- 

 tached to the cirri of the adult. The younger stage is character- 

 ised by the prominent, outwardly-turned edge of the orals 



Fig. 19. — Pentacrinoids of Polionietra prolixa, a very young stage (1) and a 

 later stage, where the arms have already begun to branch, but the 

 cirri have not yet appeared. (From Th. Mortensen, Echinod. N.E. 

 Greenland.) 1 x 45, 2x8. 



(Fig. 19, 1) ; in the older stages the stalk is very slender and 

 long, ca. 12-13 mm., with ca. 33-35 joints (Fig. 19, 2). 



An Entoproct Bryozoan, Loxosomella antedonis Mrtsn. has 

 been found on the cirri of this species, and no less than four 

 species of Myzostoma are found on it, viz. M. giganteum Nansen, 

 M. Graffi Nansen, M. Carpenteri v. Graff, and 31. cirriferum 

 Leuckart. 



