358 



THE VOYAGE OF H.M.S. CHALLENGER. 



Fig. 12. Hemipholis cordifera, Lym., 2 1 4 . Young with a disk only 5 mm. in diameter, 



from above, showing the primary plates 

 ((/,(/'). No radial shields have yet appeared. 



„ 13. Ophionereis reticulata, Ltk., ] T °. 



,, 14. „ „ ^j- 5 . Outer face of an arm bone. 



,, 15. ,, ,, l -^. Inner face of an arm bone. Observe the 



hollow process above the umbo (l). 



,, 16. Amphiura bellis, Lym., \ 2 . 



„ 17. ,, ,, 2 T 4 . Outer face of an arm bone. 



„ 18. ,, ,, 2 I 4 . Inner face of an arm bone. 



„ 19. Amphilepis norvegica, Ljn., \ 4 . 



PLATE XLI. 



Fig. 



1. 

 2. 



3. 



4. 



5. 

 6. 



Ophiopeza fallax, Pet., 1 1 . 



i_o 

 i • 



: o 

 i • 



Ophiomitra valida, Lym., 1 1 °. 



i o 

 i • 



10 



i ■ 



The interbrachial scaling; is omitted. 

 Outer face of an arm bone. 

 Inner face of an arm bone. 



Bones of a mouth angle from above, with the 

 first arm bone (iv') ; also the genital plate 

 (o) and scale (n) in position : and a radial shield 

 (/) turned somewhat from the arm. 

 Outer face of an arm bone. 

 Inner face of an arm bone. 



7. Ophioplax ljungmani, Lym., ^ 



8. Ophiolebes scorteus, Lym., 1 I °. 



9. Ophiocamax hystrix, Lym., -f. 

 10. 

 11. 

 12. Ophiacantha cuspidata, Lym., -f 



1 3 9 - 



14 ^ 



10 



1 • 



10 

 T • 



Outer face of an arm bone. 

 Inner face of an arm bone. 



Outer face of an arm bone. 

 Inner face of an arm bone. 



PLATE XLII. 



Fig. 1. Ophiotliamnus vicarius, Lym., 2 T 7 . The peculiar genital plate (o) placed on top 



of the arm. The walls of the ovarial bursas 

 (S,S), composed of lime scales. 



