PLATE LXXXVI. 



FIG. I. Bunodaster ritteri Verrill. Type. A group of dorsal parapaxillae 

 from the base of a ray ; X 10. 



FIG. ia. The same specimen. A group of dorsal plates from the base of a ray, 

 with spines removed ; X 10. 



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. 20. The same specimen; ad, adambulacral plates from near base of ray; 

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



FIG. 2&. The same specimen; o, o, 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; i, i 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 ; 

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



FIG. 40. The same specimen. Portion from near middle of radial area; am, 

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

 m, m, actinomarginal spines ; I, 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 sanguinolenta var. rudis Verrill. A group of dorsal pseudo- 

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



FIG. 50. 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. 60. The same specimen. Group of dorsal pseudopaxillse, with spinules 

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



d74) 



