466 BULLETIN 100j UNITED STATES NATIONAL MUSEUM. 



Fig. 3. A specimen from station 5348 ; dorsal surface. 



4. The same; ventral surface. 



5. Ophiacti8 affinis; ventral surface of the specimen represented in plate 62, 



fig. 6. 



6. Ophiactis maculosa from station 5136; ventral surface. 



7. The same; dorsal surface. 



8. Ophiactis profundi from station 5522. 



Plate 64. 



Fig. 1. Ophiactis definita from station 5119 ; ventral surface. 



2. Another specimen from the same station ; ventral surface. 



3. Amphioplus impressus from station 5371 ; ventral surface. 



4. The specimen from station 5369 ; dorsal surface. 



5. Ophiactis savignyi from station 5147 ; ventral surface of a specimen with 



five arms. 



6. Ophiactis savignyi from the same station ; ventral surface of a specimen 



with six arms. 



7. Ophiactis definita; dorsal surface of the specimen represented in fig. 1. 



Plate 65. 



Fig. 1. Amphiura vadicola from Otaru ; ventral surface. 



2. Another specimen ; ventral surface. 



3. The same; dorsal surface. 



4. The same ; portion of the dorsal surface of an arm. 



5. The same ; portion of the ventral surface of an arm. 



6. Amphiura uncvnata from station 5123 ; ventral surface. 



7. The same; dorsal surface. 



8. The same ; portion of the ventral surface of an arm at the base. 



Plate 66. 



Fig. 1. Amphiura commutata from Hakodate; dorsal surface. 



2. The same ; ventral surface. 



3. The same ; dorsal surface of an entire specimen. 



4. Amphiura dejecta from station 5592 ; dorsal surface. 



5. The same; ventral surface. 



6. Amphiura grandisquama from station 5348 ; dorsal surface. 



7. The same; ventral surface. 



8. Another specimen from the same station ; ventral surface. 



Plate 67. 



Fig. 1. Amphioplus legatus from station 5119 ; dorsal surface. 



2. The same; ventral surface. 



3. The same; portion of the ventral surface of an arm, more magnified. 



4. Amphioplus conductus from station 5410 ; portion of the ventral surface 



of an arm. 



5. The same ; dorsal surface. 



6. The same; ventral surface. 



7. Amphiura diomedeae from the United States National Museum ; dorsal 



surface. 



8. The same ; ventral surface. 



9. A specimen from station 5111 ; ventral surface. 

 10. The same; dorsal surface. 



