470 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Fig. 7. The same ; dorsal surface, more magnified. 



8. Ophiosonoida obscura from station 5255; dorsal surface. 



9. The same ; ventral surface. 



10. OpMolepis irregularis from station 5253; dorsal surface. 



11. The same ; ventral surface. 



12. Ophiomusium altum; lateral view of the disk. 



13. OpMosonoida obscura from station 5255 ; lateral view of an arm. 



Plate 81. 



Fig. 1. Ophioconis forbesi from La Ciotat; ventral surface. 



2. Ophiura aequalis from station 5647; lateral view of an arm. 



3. OpMopyrgus planwlatus from station 5613; dorsal surface. 



4. The same ; ventral surface. 



5. Ophiurodon cinctus from station 5147; ventral surface. 



6. Ophiura aequalis from station 5647 ; dorsal surface. 



7. Ophiura mitescens from Hakodate; ventral surface. 



8. The same; lateral view of an arm. 



9. The same ; dorsal surface. 



10. Ophiura aequalis from station 5647 ; ventral surface. 



Plate 82. 



Fig. 1. Amphiophiura fastigiata from station 5259 ; lateral view. 



2. The same ; ventral surface. 



3. The same; dorsal surface. 



4. The same ; dorsal surface, more magnified. 



5. Amphiophiura spatulifera from station 5274; dorsal surface of the 



specimen B. 



6. The same; ventral surface. 



7. The specimen A from station 5425 ; dorsal surface. 



8. The same ; ventral surface. 



9. Homalophiura inornata from station 5444 ; dorsal surface. 



10. Amphiophiura canaliculata from station 5356; ventral surface. 



11. The same; dorsal surface. 



12. The same ; lateral view of an arm. 



13. Amphiophiura spatulifera from station 5274; lateral view of an 



arm. 



Plate 83. 



Fig. 1. Stegophiura sterea from station 3771 ; dorsal surface. 



2. The same ; ventral surface. 



3. The same ; lateral view of an arm. 



4. Stegophiura sladeni from Hakodate ; ventral surface. 



5. The same; dorsal surface. 



6. The same ; lateral view of th# disk. 



7. The same ; lateral view of an arm. 



8. Stegophiura sterilis from station 5301 ; dorsal surface. 



9. The same; ventral surface. 



10. The same ; lateral view of an arm. 



11. The same ; lateral view of the disk. 



Plate 84. 



Fig. 1. Stegophiura sladeni from Hakodate ; ventral surface of a specimen with 

 four arms. 

 2. Homalophiura infiata from station 5660; dorsal surface. 



