Plate 9 

 Leptasli rias arctica 

 • ■ l. Station 3294, forma beringensis, abactinal skeleton, external view, X5. The lowermost 



i.iu of plates C c) are the carinals; Al>, direction of disk. 



2. Specimen from northern Bering Sen, forma arctica; abactinal skeleton from coelomic 



sidi ; c c, carina] series; ,<10. 



3. Station 3504, forma beringensis; abactinal skeleton, from coelomic side. This specimen 



has a heavier skeleton than Figure 2; c e carina! plates; 10. 



I. Station 3536, forma beringensis; specimen with robust rays. Small portion of abactinal 

 surface showing carinal spines, -.5. 



5. Station :5. r >12, forma beringensis; odontophore from above; /. interradial septum; ambu- 



lacral ossicles mi either side; X 10. 



6. Station 3536, forma beringensis; adambulacral, actinal, and inferomarginal spines; three 



ecutive adambulacral series are shown; AD, adambulacral; AC, actinal; / 

 inferomarginal; X 10. 



7. Forma arctica, straighi pedicellaria from a suboral spine, cotype, 50. 



8. Forma nn-iicn. an unguiculate pedicellaria from actinal interradial region, cotype, 50. 



9. Station 3543, forma beringensis; two views of an actinal interradial or axillary pedicel- 



laria. 25. 



10. 11. Station 3543, forma beringensis; two unguiculate abactinal pedicellariae, the larger 



0.9 mm. long, 50. 

 12. Station 3543, forma s; a straight pedicellaria from furrow face of adambulacral 



plate. 100 



264 



