360 



THE VOYAGE OF H.M.S. CHALLENGEE. 



Fig. 14. Ophiocnemis marmorata, JMlill. & Tr. 



10 



1 



15. 



16. Ophlostigma isacanthum, Lym., Y- 



Skeleton of the base of an arm, with 



portions of two mouth angles seen 



from above. The great radial 



shield (/) is pushed on one side to 



show the underlying parts. 



An angle of the mouth, with parts 



of two arm joints seen from below. 



The genital plates (o) lie on top of the arm 



as in Ophiothamnus. 



10 



1 



PLATE XLIII. 



Fis. 1. 



3. 



4. 

 5. 



6. 



7. 



8. 



9. 



10. 



11. 

 12. 

 13. 

 14. 

 15. 



Ophiomyxdfiacckla, Ltk., ^^. A side arm plate (/), having thorny arm spines 



[p) and continued by broken pieces homo- 

 logous with an upper arm plate {j). 



An under arm plate, seen from above ; one 

 side of tentacle socket (r). 



Two side arm plates {i,i), and an under arm 

 plate (/i), seen from above and inside. The 

 dark spot is the hole for the tentacle. 



10 



1 • 



10 



1 • 



Sigsheia murrhina, Lym., f. 



Outer face of an arm bone. The structure of the 



joint resembles that of the Astrophytons. 

 Inner face of an arm bone. 



Ilcmieuryale pustulata, V. Mart. 



12 



1 • 



1_8 

 1 • 



18 



1 • 



Outer faces of an arm bone. 

 Liner face of an arm bone. 

 Side view of an arm bone. 



Its lensth 



OjjJi.iochondnis convolutus, Lym., ^^3. 



20 



1 • 



2 



1 • 



and massiveness are characteristic. 



Outer face of an arm boae. 



Inner face of an arm bone. 



Under side of an arm bone. 



Upper side of an arm bone. Both 



figures show the exceptional length 



and massiveness. 



