394 BULLEllN 76, UNITED STATES NATIONAL MUSEUM. 



Plate 30. Gephyreast-er swifti. 



Fig. 1. Abactinal view of largest epecimen. 



2. Actinal Burface of type. 



3. Abactinal paxilloD, enlarged. 



4. Actinal Burface of ray, enlarged, nhowing adambulacral, actinal intermediate, and marginal 



plates. 



Plate 31. 



Fig. 1. Pseudarchaster parelii; specimen from station 322.5. 



2. Same; superomarginal plates and paxillae, enlarged. 



3. Pseudarchastcr parelii alascensis; typical specimen. 



4. Same; abactinal paxilloe, enlarged. 



5. Same; superomarginal plates and adjacent paxillse, enlarged. 



Plate 32. Pseiuiarchaster piLsillus. 



Fig. 1. Type; abactinal surface. 



2. Variety with shorter rays. 



3. Variety with large paxillse. 



4. Type; actinal surface, enlarged. 



Plate 33. 



Fig. 1. Pseudarchastcr pitsiHus; abactinal surface of type, enlarged. 



2. Same; abactinal surface of specimen with large paxillse, enlarged. 



3. Pseudarchaster parelii; typical, actinal surface, enlarged. 



4. Pseudarchaster parelii alascensis; actinal surface, enlarged. 



Plate 34. Pseudarchaster dissonus. 



Fig. 1. Type; abactinal surface. 



2. Type; portion of abactinal surface, base of ray, enlarged. 



3. Portion of actinal surface of ray, enlarged, the adambulacral plates shown in lower right comer, 



the inferomarginala in upper left. 



Plate 35. Mediaster sequalis. 



Fig. 1. Abactinal surface, specimen from station 4281. 



2. Portion of abactinal surface enlarged; Alaskan specimen. 



3. Actinal surface enlarged; Alaskan specimen. 



Plate 36. Mediaster tenellvs. 



Fig. 1. Type; abactinal surface, slightly enlarged. 

 2. Same; portion of actinal surface, enlarged. 



Plate 37. 



Fig. 1. Ceramaster japonicus; large specimen from station 3331; specimen B referred to in text. 



2. Same; specimen A from station 3330. 



3. Same; portion of actinal surface for comparison with that of C. palagonicus below (fig. 4). 



4. Ceramaster palagonicus; portion of actinal surface for comparison with C. japonicus. 



Plate 38. » 



Fig. 1. Ceramaster palagonicus: vicinity of Naha Bay, Behm Canal, Alaska, station 4228,. 



2. Same; specimen from Bering Sea, for comparison. 



3. Ceramaster clarhi; type. 



4. Same; portion of actinal surface, enlarged. 



