NARRATIVE OF THE CRUISE, 



307 



upper surfaces of these are articulated the third radial* or axillaries, but by ligaments 

 only and without the intervention of muscles. Each axillary bears two arms, so that 



Fio. 120. — Bathycrinus cnmpbellianus, 

 Wyv. Thorns., M.S. 



Fig. 121. — Bathycrinus gracilis, Wyv. Thorns. 



there are ten arms in all, and nut five only as in Rhizoerinus. As in tin's genus, too, the 

 arm-bases bear no pinnules, and most of the joints are united in pairs. The union, 



