458 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Fig. 4. The same ; dorsal surface. 



5. Ophiacantha composita from station 5119; ventral surface. 



6. The same; dorsal surface. 



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



8. Ophioripa nugator from station 4781 ; dorsal surface 



9. The same ; ventral surface. 



Plate 24. 



Fig. 1. Ophioplinthaca rudis, a specimen from station 5450; dorsal surface. 



2. The same; ventral surface. 



3. A specimen from station 5618 ; dorsal surface. 



4. A specimen from station 5606 ; ventral surface of an arm. 



5. A specimen from station 5444 ; dorsal surface of an arm. 



6. A specimen from station 5450; ventral surface of an arm. 



7. Ophioplinthaca globata from station 5187 ; ventral surface. 



8. The same; dorsal surface. 



Plate 25. 

 Ophioplinthaca glooata. 



Fig. 1. A specimen from station 5656 ; ventral surface. 



2. The same ; dorsal surface. 



3. A specimen from station 5444 ; ventral surface. 



4. A specimen from station 5423 ; dorsal surface. 



5. The same; ventral surface. 



6. A specimen from station 5219 ; ventral surface. 



7. The same; dorsal surface. 



8. A specimen from station 5123 ; dorsal surface. 



Plate 26. 



Fig. 1. Ophiomedea diserepans from station 5359 ; lateral view of an arm with 

 the arm spines. 



2. The same; ventral surface. 



3. The same ; dorsal surface. 



4. The same ; lateral view of an arm without the arm spines. 



5. Ophiomitrella subjecta from station 5280; dorsal surface 



6. The same; ventral surface. 



7. The same ; dorsal surface more magnified. 



8. A specimen from station 5325 ; dorsal surface. 



9. The other specimen ; dorsal surface. v 



Plate. 27. 



Fig. 1. Ophiomitrella sagittata from station 5629; dorsal surface. 



2. The same; ventral surface. 



3. The same ; dorsal surface ; more magnified. 



4. The second specimen from station 5629; ventral surface. 



5. Ophiocamax rugosa from station 5275 ; dorsal surface. 



6. The same ; ventral surface. 



7. The same; dorsal surface of an arm at its base, more magnified. 



8. The same ; ventral surface of an arm near its tip. 



9. Ophiomitrella sagittata from station 5623; ventral surface. 



