PLATE L. 



Fig. i. Dermasterias imbricata (Grube) Perrier. a, c, pedicellariae, mostly 



bivalved, from actinal side; X 26. 

 Fig. 10. The same specimen, a-c, bivalved and trivalved pedicellariae from 



the actinal side; X 26. 

 Fig. ib. The same specimen, a-f, four-valved and five-valved pedicellariae 



from the dorsal side ; X 26. 

 Fig. 2. Ceramastcr granulans (Retz.) Verrill. Plates of the dorsal side 



covered with granules ; the central one bears a bivalved pedicel- 



laria; X 8. 

 Fig. 2a. The same specimen, with the granules removed from two of the 



plates ; X 8. 

 Fig. 3. Tosiaster arcticus Verrill. Type. A group of dorsal plates, par- 

 tially in profile; some of them (c, c) with the large granules 



removed ; also showing papular pores ; X 8. 

 Fig. 3a. The same specimen. A group of dorsal plates, some of them (c, c) 



with the granules removed ; p, bivalved pedicellariae ; X 8. 

 Fig. 4. Hippasteria spinosa Verrill. Type, a', a inner, and a, outer adam- 



bulacral spines ; p, p' , pedicellariae of actinal plates ; X 8. 

 Fig. dfl. The same specimen. A group of dorsal plates and spines; p, p, 



pedicellariae; X 8. 

 Fig. \b. The same specimen. One of the dorsal plates with a pedicellaria ; 



X about 16. 

 Fig. 4c. The same. A dorsal pedicellaria of the broad form ; X about 16. 

 Fig. 5. Astropecten calif ornicus Fisher. Actinal side ; a', a', inner, and 



a, a, outer adambulacral spines ; m, m, inferomarginal plates ; 



c, c, inferomarginal spines ; X 8. 

 Fig. 6. Astropecten sidcrealis Verrill. Actinal side ; a, a, outer adambu- 

 lacral spines ; a, central spine of the adambulacral plate ; a", 



furrow spines ; c , c, inferomarginal spines ; m, m, inferomarginal 



plates; X 8. 

 Fig. 7. Stenasterias macropora Verrill. Type. Portion of the actinal side 



of a ray, with the spines removed ; X 5- 



(l02> 



