THE VOYAGE OF H.M.S. CHALLENGER. 



SECOND PAET. 



PAGE 



II. Subclass OSCULOSA 889 



Legion III. NASSELLAKIA vel MONOPYLEA, ..... 889 



Order 11. NASSOIDEA, . . . . . . . 895 



12. PLECTOIDEA, ........ 898 



13. STEPHOIDEA, ........ 931 



14. SprBoiDEA, ........ 1015 



15. BOTBYODEA, ........ 1103 



16. CTBTOIDBA, ........ 1126 



Legion IV. PBLEODARIA vel CANNOPYLEA, ..... 1521 



Order 17. PH^OCTSTINA, . ...... 1542 



18. PttEOSPffiERIA, ...... 1590 



19. PH.EOGBOMIA, ....... 1642 



20. PH.EOCONCHIA, ....... 1710 



NOTE ON THE DIMENSIONS AND MEASUREMENTS, ..... 1760 



ADDENDA, ...... ... 1761 



EEEATA, . ... .... . 1763 



INDEX, . 1765 



