356 THE VOYAGE OF H.M.S. CHALLENGER. 



Fig. 16. OpMoceramisjanuari^Jjym.,^;. This and the three preceding genera have 



massive genital plates, with a small genital 

 scale attached near the inner end. 



„ 17. ,, „ \ 2 . Outer face of an arm bone. The lozenge- 



shaped depressions on each side of the 

 articulating peg are peculiar. 



,,18. ,, „ X T 2 . Inner face of an arm bone. 



PLATE XXXVIII. 



Outer face of an arm bone. 



Inner face of an arm bone. 



Under side of an arm bone (t' should be t). 



Upper side of an arm bone (t should be t'). 



Outer face of an arm bone. 



Inner surface of an arm bone. 



Arni bone from below, peculiar in its three- 

 sided outline ; the small tentacle sockets 

 (r) and the irregular lower canal (t). 



10. Ophioglypha lymani, Ljn., f. 



11. „ ,, 1 x °. Outer face of an arm bone. 

 12. 



13. 

 14. 

 15. 

 16. 

 17. 



l ^ > . Inner face of an arm bone. 

 Y*- Profile view of an arm bone. 



bulletin, Lym. 



11 

 > i • 



„ ^. Outer face of an arm bone. 



,, ij 8 . Inner face of an arm bone. 



„ 1 T 8 . Profile view of an arm bone. 



18. Ophiocten sericeum, Lym., f. 



19. „ ,, 1 I 6 . Outer face of an arm bone. 



20. ,, ,, 1 1 e . Inner face of an arm bone. 



21. ,, ,, y*. Profile view of an arm bone. 



22. Ophioglypha deshayesi, Lym., f. 



23. ,, ,, l r °. Outer face of an arm bone. 



24. ,, „ ^o. Inner face of an arm bone. 



25. ,, ,, \ y . Profile view of an arm bone. 



