PLATE L. 



FIG. I. Dermasterias imbricata (Grube) Perrier. a, c, pedicellarias, mostly 



bivalved, from actinal side ; X 26. 

 FIG. ia. 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. Ceramaster granularis (Retz.) Verrill. Plates of the dorsal side 



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



laria ; X 8. 

 FIG. 20. 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. 30. 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. 40. The same specimen. A group of dorsal plates and spines ; p, p, 



pedicellariae; X 8. 

 FIG. 4&. 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. Astropectcn 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 siderealis 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- 



(1021 



