PLATE XLVIII. 



FIG. I. Hippasteria phrygiana (Parel.) Agassiz. Part of the dorsal surface 



of a New England specimen (314) ; X 6. 

 FIG. 2. The same. One of the jaws and adoral plates; a, a', first and second 



adambulacral plates ; ep, epioral spines ; pr, apical peroral spines ; 



o, large valvular pedicellaria on first actinal interradial plate; 



X6. 

 FIG. 3. The same. Two inferomarginal plates (") and adjacent interactinals ; 



X6. 

 FIG. 4. The same. Central part of disk, showing dorsal " anal " or nephridial 



pore; X 6. 

 FIG. 5. The same. Three adambulacral plates and spines (o) and adjacent 



interactinal plates, each bearing a large valvular pedicellaria ; X 6. 

 FIG. 6. Orthosterias tanneri Verrill. a, outer, and a', inner adambulacral 



spines ; m' ' , supramarginals, and m", inferomarginals ; o, one of the 



large, acute major pedicellariae ; X 7- From off the Atlantic coast. 



No. 5524. Yale Mus. 



(98) 



