AND ECHINOIDEA OF THE KOKEAN SEAS. 



445 



the Korean Seas, that whilst a large proportion of the Asteroids 

 point to a northern centre of derivation, the Echinoidea, on the 

 other hand, all belong to species having a southern and westward 

 area of distribution. 



DESCEIPTION OF PLATE VIII. 

 Fig. 1. Astropecten formosus. Abactinal aspect, natural size. 



2. Actinal side of same specimen, about the middle of a ray, X 10. 



3. Arrangement of the foot-papillce on the inner portion of the ambulacral 



furrow, X 10. 



4. Abactinal side of same specimen, about the middle of a ray, X 10. 



5. Cribrella densispina. Abactinal aspect, natural size. 



6. Actinal side of same specimen, about the middle of a ray, X 10. 



7. Arrangement of the foot-papilli£, seen somewhat obliquely, and more 



highly magnified. 



8. Abactinal side of same specimen, about the middle of a ray, X 10. 



9. Madreporiform body of same specimen, X 10. 



10. Tonnopleurus toreiimaticus (Klein), Ag. (?), juv. ; profile, natural size. 



11. Actinal aspect of same specimen, natviral size. 



12. Portion of test of same specimen, X 10. 



13. Apical disk of same specimen, X 10. 



14. Echinocardium australe, Graj. A young specimen 7"75inillims. in length ; 



abactinal aspect, X 5. 



15. Actinal aspect of same specimen, x5. 



16. Longitudinal profile of same specimen, X 5. 



17. Portion of the posterior end of the test of same specimen, showing the 



separation of anal and subanal fascioles, magnified. 



On some Ophiuroidea from the Korean Seas. By Professor 

 P. Martin Duncan, M.B. (Lond.), F.E.S., &c. (Commu- 

 nicated by W. Peect Sladen, Esq., P.L.S.) 



[Eead June 6, 1878.] 



(Plates IX.-XI.) 



I. Introduction and General Relations of the Fauna. 

 II. List of Families, Genera, and Species. 



III. Description of the New Species, and notices of those hitherto 



known. 



IV. Remarks on the Species, and on their Affinities. ; 



V. Description of the Plates. 



I. Introduction and JRelations of the Fauna. 

 Capt. St. John, E.N., in his late voyage in and about the seas to 



