122 ME. P. H. CAEPEXTEE ON THE GENUS ACTINOMETEA. 



(X u Y,) by which each is connected with the central nervous envelope of the quinquelocular 

 organ. The other branches (X 2 , Yj) of the two primary cords (X& Y) combine to form the 

 axial cord of the radius D. The inner end of its first radial is seen in the centre of the upper 

 part of the figure (r{), separated from those of G'&_Eby the axial interradial canals (a.i.c). 

 Fig. 8. A section rather further from the centre of the calyx, showing the first radial of D cut trans- 

 versely, with the closed central end of its radial space [r.s.) . At the sides of the latter are 

 the expanded dorsal ends of the axial interradial canals seen in fig. 7 ; they are received in 

 depressions (s) at the central ends of the rays of the basal star, which are ossified around 

 the vertical fibres (So) only, and not, like the stouter more peripheral portions of the rays, 

 arouud both vertical and diverging fibres, as is seen in Plate III. fig. 6, S u S 2 . 



