468 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Fio. 4. Ophiomastis annulosa from Nasugbu reef; ventral surface. 



5. The same; dorsal surface. 



6. Ophiocoma brevipes; ventral surface. 



7. A specimen from Mauritius ; ventral surface. 



8. The same ; dorsal surface. 



9. The same; ventral surface. 



Plate 73. 



Fig. 1. Ophiocoma lineolata from Ceylon; dorsal surface. 



2. A specimen from Mauritius ; dorsal surface. 



3. A specimen from station 5109 ; dorsal surface. 



4. The specimen from Ceylon ; ventral surface. 



5. Ophiocoma scolopendrina; the dorsal part of the disk is raised to show 



the mouthpieces on their interior surface. 



6. Ophiocomina nigra; same preparation. 



7. Ophiocoma crinaceus from station 5109; dorsal surface. 



Plate 74. 

 Ophiocoma scolopendrina. 



Fig. 1. A specimen with the upper arm plates rather small ; dorsal surface. 



2. The same; ventral surface. 



3. A specimen from the Philippines; ventral surface. 



4. The same ; dorsal surface. 



5. A specimen from Batavia ; ventral surface. 



6. A specimen from Mauritius with the upper arm plates very large ; dorsal 



surface. 



7. The same ; ventral surface. 



Plate 75. 



Fig. 1. Ophiocomina nigra from the Azores; dorsal surface. 



2. The same ; ventral surface. 



3. Another specimen from the same region; ventral surface. 



4. A specimen from Sicily ; ventral surface. 



5. A specimen from Roscoff ; ventral surface. 



6. A specimen from the Faroe Islands ; ventral surface. 



7. Ophiocoma wendtU from Samoa ; dorsal surface. 



8. The same; ventral surface. 



Plate 76. 



Fig. 1. Ophiochiton fastigatus from station 5585; dorsal surface. 



2. A specimen from station 5582 ; dorsal surface. 



3. The same; ventral surface. 



4. A specimen from station 5348 ; dorsal surface. 



5. A specimen from station 5619 ; ventral surface. 



6. A specimen from station 5650; ventral surface. 



7. A specimen from station 5585 ; ventral surface. 



8. A specimen from station 5348 ; ventral surface. 



9. Ophiochiton ambulator from the Sunda Islands ; ventral surface. 



10. Ophiochiton fastigatus from station 5619; dorsal surface. 



11. A specimen from station 5582 ; portion of the ventral surface. 



12. Ophiochiton ambulator from the Sunda Islands ; dorsal surface. 



13. The same; ventral surface. 



