OPHIUROIDEA FROM THE KOREAN SEA. 



481 



Ophiactis sexradia, Grube,tlie O. BeinTiardtii figured by Liitkeii, 

 is evidently represented in the Korean fauna ; and its range is 

 enormous between America and Africa. 



Ophincfis affinis so closely resembles an Ampbiuran, that were 

 it not for the spines on the margin and on the disk below, the 

 propriety of making this spination any thing more than of spe- 

 cific value may well be doubted. It belongs to a group allied to 

 O. simplex, Liitk., and O. MuUeri, Liitk., the one from Panama 

 and the other from the West Indies. 



The species of OpTiiacantha is remarkable for the development 

 of the side arm-plates, the nodular condition of the arm, and the 

 small spines. It is a very distinct type. 



The Opliiotlirix is very variable, and belongs to the section with 

 numerous glassy toothed spines, hooks with two claws, and an 

 oval of numerous tooth-papillae, numbering nearly twenty. 

 Stumps bifid or trifid. 



Finally, the OphiotJiela, closely allied to O. isidicola, differs 

 principally in the ornamentation of the disk. 



DESCRIPTION OF THE PLATES. 

 Plate IX. 



Fig. 1. Ophioglypha Forhesi, nobis, from above, X8. 



2. „ „ „ from below, x8. 



3. ,, ,, ,, last lower arm-plates, x8. 



4. Ophioglypha striata, nobis, from above, X 8. 



5. „ „ „ side of arm, X 8. 



ba. ,, ,, „ serrature of side arm-plates, more mag- 



nified. 



6. Ophioglypha scidpta, nobis, from above, X 8. 



7. „ ,, „ from below, x8. 



8. „ „ ,, upper arm-plate, X8. 



9. Ophioglypha Sladeni, nobis, from above, X 8. 



10. „ „ ,, from below, X8. 



11. ,, „ „ side of arm showing extra spines, x8. 



12. Ophiolepis mirabilis, nobis, from above, x8. 



Plate X. 



13. Ophiolepis mirabilis, nobis, from below, x8. 



14. ,, ,, ,, side arm-hooks, highly magnified. 



15. Ophion^reis variegata, nobis, oblique view, part of arm and disk, x8. 



16. „ „ „ from below, X 8. 



17. Amphi'ura LiitJceni, nobis, oral structures, x8. 



18. Amphiura korecB, nobis, from above, x8. 



19. „ „ „ oral structures, x8. 



20. Hemipholis microdiscus, \\0h\9, from above, x8. 



21. ,, „ from below, x8. 



LINN. JOUEN. — ZOOLOGT, YOL. XIY. 35 



