PLATE LXXIV. 



Fig. I. Pycnopodia helianthoides. Very young, with nine rays; i, odd 

 anterior primary ray; 2, 2', first pair of interpolated rays; 3, 

 small budding ray of second pair; 3', position in which the mate 

 to No. 3 should appear, but no rudiment of it is visible externally ; 

 a, odd posterior primary ray; h, h' and c, c', second and third 

 pairs of posterior primary rays ; X zV%- From Dutch Harbor, 

 Alaska. 



Fig. 2. The same. A somewhat larger specimen with ten rays, in normal 

 order; X 3^. Lettering as in fig. i. From Kadiak. 



Fig. 3. The same. A somewhat larger, abnormal, oblong young specimen 

 with eighteen rays, not all in regular order (see page 200) ; m, 

 madreporic plate of abnormal size ; X 2%. Lettering of rays 

 as in fig. 2, with the addition of pairs 4 and 5 anteriorly, and 

 d, d' and e, e' posteriorly. The last two pairs are abnormal; 

 c is an abnormal budding ray. From Kadiak, Alaska. 



Fig. 3fl. The same specimen. Actinal side ; X 3- Lettering as in fig. 3. 



Fig. 4. Stenasterias macro p or a Verrill. Type. Portion of the actinal side 

 with the spines removed ; X 3- 



Fig. 5. Leptychaster paciHcus Fisher. Dorsal view; X about 2. 



Fig. 6. Pycnopodia helianthoides (Brandt). Minor pedicellariae ; a, b, c, 

 side and profile views ; X 165. 



(150) 



