356 



THE VOYAGE OF H.M.S. CHALLENGER. 



Fig. 16. Ophioceramisjanuarii,'Lym..,\. 



17. 



12 



T • 



L2 

 1 • 



This and the three preceding genera have 

 massive genital pLates, with a small genital 

 scale attached near the inner end. 



Outer face of an arm bone. The lozenge- 

 shaped depressions on each side of the 

 articulating peg are peculiar. 



Inner face of an arm bone. 



PLATE XXXVIII. 



Ophioplinthus medusa, Lpn., \. 



12 



1 • 



1^2 



1 • 



Ophiernus vallincola, Lym., f . 



10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 



0'pliioglyp)lia lymani, Lju. 



1_2 



1 • 



12 

 1 • 



L2 

 1 • 



' 1- 



LO 

 1 • 



10 



1 • 



10 

 1 • 



hvUata, Lym., ^^. 



13 



1-8 



1 • 



18 

 1 ■ 



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 shov;ld be t'). 



Outer face of an arm bone. 



Inner surface of an arm bone. 



Arm bone from below, peculiar in its three- 

 sided outline ; the small tentacle sockets 

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



Outer face of an arm bone. 

 Inner face of an arm bone. 

 Profile view of an arm bone. 



Outer face of an arm l^one. 

 Inner face of an arm bone. 

 Profile view of an arm bone. 



16 



1 ■ 



16 



1 ■ 



1 6 



T • 



Ophiocten sericeum, Lym., f. 



Outer face of an arm lione. 

 Inner face of an arm bone. 

 Profile view of an arm l)one. 

 Opliioglypha deshayesi, Lym., f. 



,, „ ijO. Outer face of an arm bone. 



,, „ lyO- Inner face of an arm bone. 



„ „ \^. Profile view of an arm bone. 



