EXPLANATION OF PLATES 



227 



Figure 2c. The same. Dorsal side of a superomarginal plate (m) and 

 projecting border of the inferomarginal plates (i, i) and bases of 

 spines. X 13. 



Figure 2d. The same. One of the dorsal paxillary rosettes. X 16. 



Figure 2e. The same. Three rosettes more enlarged. X 2i. 



Figure 3. Astropeften co nipt us Yerrill, Type. (No. 8,514, N. Mus.) 

 Dorsal view of portion of a ray. X ■^. 



Figure 3a. The same specimen. Under side of portion of a ray. X 4. 



Figure Sh. The same. One of the fasciolated grooves between the in- 

 feromarginal plates. X 10. 



Figure 3c. The same. Two of the dorsal paxillary rosettes. X 24. 



Figure 4. Prionaster elegans Yerrill. Type. Under side of a part of 

 the disk and base of a ray. X 4i/4. 



Figtire 4a. The same specimen. Under side of a part of the disk and 

 base of a ray. X 4V2. 



Figure 4&. The same specimen. Tip of a ray. X 6. 



Figure 4c. The same. One of the dorsal paxillary rosettes, enlarged. 



Figure 5. Sideriaster grandis Yerrill. Type. Under side of portion of a 

 ray. X 4. 



Figure 5a. The same specimen. An adambulacral plate and its spines. 

 X 6. 



Figure 5h. The same. One of the dorsal paxillary rosettes. X 4l^/2. 



Plate XIII 



Figure 1. Blakiaster conicus Perrier. Portion of the proximal part of a 

 ray, under side; ad, adambulacral plates and spines; ia, interactinals ; 

 m, inferomarginals. X 10, 



Figure la. The same. Dorsal plates and papuliE after removal of spin- 

 ules. X 12. 



Figure 1&. The same specimen. A superomarginal plate and adjacent dor- 

 sal paxillae. XIO. 



Figure Ic. The same. Two of the papillifonn pedicellariae (/j), much en- 

 larged. 



Figure 2. Linchia nodosa Perrier. Dorsal side of a ray. X 4. 

 Figure 2a. The same specimen. Yentral side of part of a ray. X 4. 

 Figure 3. Ophidiaster alexandri Yerrill. Type. Dorsal side of part of a 

 ray. X 4. 



Figure 3a. The same specimen. Under side of part of a ray. X 4. 



Figure 3&. The same specimen. Under side of a portion of a ray with 

 spinules removed to show plates; a, adambulacral plates; ai, adambula- 

 cral spines; i, i, interactinal plates, in three rows; m, m, inferomargin- 

 als; ml, m^, superomarginals. X 4. 



Figure 4. Clicetc'^ter nodosus Perrier. Portion of under side of a ray; 

 ad, adambulacral plates; m, marginal plate. X 16. 



Figure 4a. The same specimen. Portion of the dorsal side of the base of a 

 ray. X 16. 



