Plate 81 



Fig. 1 3. Sclerasterias heteropaes six-rayed, fissiparous young from station 4431, <3J.^. Three 

 new rays are appearing symmetrically after the animals have divided in two. In 

 figure 1 the longest radius is 10 mm. 



4. Sclerasterias heteropaes, a five-rayed young from station 441(i, X33-5- From the 



same haul was taken a small symmetrical six-rayed specimen with equal radii. 

 (B, 7.5 mm.) 



5. Sclerasterias heteropaes, si at inn 4328; six-rayed young with three very small regen- 



erating rays; longest radius, 15 mm., X3J^. 



6. Sclerasterias alexandri, station 331)7, off Panama, 85 fathoms; young in six-rayed 



stage with three regenerating rays, X3J^. Referred to in the text. 



7. Sclerasterias euplecta, station 1046, west coast of Hawaii, 147 fathoms; symmetrical 



five-rayed young, longest radius 8 mm. 



8. Distolasterias nipon, Peter the Great Bay, near Vladivostok, 1926; collected by the 



Pacific Marine Station. One of the types of D. tricolor Djakonov (now in Museum 

 of Comparative Zoology). Radius shown, 127 mm. 

 242 



