PLATE LXXXVI. 



Fig. i. Bunodaster ritteri Verrill. Type. A group of dorsal parapaxillae 

 from the base of a ray ; X 10. 



Fig. io. The same specimen. A group of dorsal plates from the base of a ray, 

 with spines removed ; X io. 



Fig. 2. Dermasterias imbricata (Grube). Young. One of the interactinal 

 areas deprived of spines; ad, adambulacral plates, o, jaw plates; 

 im, inferomarginals : p, p, first rows ; P' , P" , second rows of inter- 

 actinal plates ; I, I and 2, 2 and 3, 3, first three pairs of interac- 

 tinal plates ; u, u, odd or unpaired plates ; X 5- 



Fig. 2a. The same specimen ; ad, adambulacral plates from near base of ray ; 

 p, two rows of interactinal plates ; m, inferomarginals ; X 5- 



Fig. 2b. The same specimen; 0, 0, jaw-plates; ad, adoral adambulacrals ; f, 

 rudimentary plates, perhaps superambulacral ; ib, interbrachial 

 septum; X 5- 



Fig. 2c. The same specimen. Supramarginal plates, from inner side; 1, 1 and 

 2, 2, first and second interradial pairs ; X 5- 



Fig. 3. Solaster stimpsoni Verrill. Type. One of the adambulacral combs of 

 spines. 



Fig. 4. Pteraster tesselatus Ives. A jaw and adoral parts; o, o, apical oral 

 spines ; o' , o' , lateral oral spines ; e, e, hyaline epioral spines ; 

 1, 2, 3, first three pairs of adambulacral combs; X 5- 



Fig. 4a. The same specimen. Portion from near middle of radial area; am, 

 ambulacral groove ; a-d, four combs of adambulacral spines ; 

 m, m, actinomarginal spines ; /, latero-ventral surface ; X 5- 



Fig 4&. The same specimen. Part of an interbrachial area, rendered trans- 

 lucent by varnish ; a, a, a, spinules of parapaxillae as seen through 

 the translucent skin; m, actinomarginal spines; ad, adambu- 

 lacrals ; X 5- 



Fig. 4c. The same. One of the hyaline epioral spines ; X 10. 



Fig. 5. Henricia sanguinolcnta var. rudis Verrill. A group of dorsal pseudo- 

 paxillae from the base of a ray; X 16. Point Franklin. No. 7623. 



Fig. sa. The same specimen, a-d, adambulacral spines ; X 16. 



Fig. 6. Henricia tumida borealis Verrill. Type. A group of dorsal ossicles, 

 mostly with spinules removed from the base of a ray ; X 10. 



Fig. 6a. The same specimen. Group of dorsal pseudopaxillae, with spinules 

 and papular pores; X 10. Alaska, Harrhnan Expedition. 



(>74) 



