454 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Fig. 16. 17. The same; dorsal surface of an arm treated Avith Javelle water. 

 18. Ophiomyxa irregularis from station 5172 ; lateral view of the disk. 



Plate 3. 

 Ophiophrixus confinis. 



Fig. 1. A specimen from station 5592 ; dorsal surface. 



2. The same ; ventral surface. 



3. The same; ventral surface of an arm. 



4. The specimen from station 5123 ; ventral surface of an arm. 



5. The same; lateral view of an arm with the arm spines. 



6. The same ; dorsal surface of the entire specimen. 



7. The same ; dorsal surface of the disk, more magnified. 



8. The specimen from station 5592 ; dorsal surface. 



Plate 4. 



Fig. 1. Ophiarachna afflnis; ventral surface of a specimen from Amboina. 



2. Ophiobyrsella intorta from station 5491; dorsal surface of the disk. 



3. The same ; lateral view of an arm with the arm spines. 



4. The same ; dorsal surface of the entire specimen. Reduced. 



5. The same ; ventral surface of the disk. 



6. Ophiarachna incrassata from the Sunda Islands ; ventral surface. 



7. The same ; dorsal surface. 



Plate 5. 



Fig. 1. Ophiomyxa irregularis from station 5172 ; ventral view of the entire 

 specimen. 

 2. The same; dorsal surface of the disk. 



3. Ophiomoeris obstricta from station 4893 ; ventral surface. 



4. The same ; dorsal surface. 



5. Ophiomyxa bengalensis from station 5292; dorsal surface. 



6. The same; ventral surface. 



Plate 6. 



Fig. 1. Ophiophthahnus suspectws; ventral surface. 



2. The same ; dorsal surface. 



3. Ophiodera neglecta from station 5378 ; lateral view of an arm. 



4. Ophiomyxa irregularis from station 5172 ; lateral view of an arm. 



5. Ophiogyptis nodosa from station 5414 ; dorsal surface. 



6. The same; ventral surface. 



7. Ophiodera neglecta from station 5378; dorsal surface. 



8. The same; ventral surface. 



Plate 7. 



Fig. 1. Ophiarachna quinquespinosa from station 5172; dorsal surface. 



2. The same; ventral surface. 



3. The same; lateral view of an arm. 



4. Ophiodictys uncinates from station 5668 ; a hook-shaped spine. 



5. The same ; dorsal surface of an arm toward the proximal third. 



6. The same ; two arm spines from about the middle of an arm. 



7. The same ; a hook-shaped spine. 



8. The same ; a side arm plate seen in profile. 



