272 RECENT OPHIURANS. 



820. O. EXIGUA Lyman, 1874. Bull. M. C. Z., 3, p. 236, pi. 4, f. 24-26. Koehler, 1905. Siboga-exp. 



Oph. litt., pi. 9, f. 15, 16. 



13 specimens, including holotype and 10 paratypes. Philippine Is- 

 lands, 6-35 fms. Hong Kong. Amboina. 



821. 0. EXPEDITA Koehler, 1905. Siboga-exp. Oph. litt., p. 96, pi. 9, f. 10-14. 



1 COTYPE. Dutch East Indies: Sapeh Strait, 38 fms. 



822. 0. FRAGILIS (Abildg aard) . 



Aslerias fragiUs Abildgaakd, 1789. In Mullers Zool. Dan., 3, p. 28, pi. 98. 

 Ophiothrix fragilis DtJBEN and Koren, 1846. Kongl. Vet.-akad. Handl. f. 1844, p. 238. 



28 specimens. Northern Europe. Sweden: Bohuslan. Norway. Den- 

 mark: Oresund. Heligoland. 



823. O. FUMAHIA Muller and Troschel, 1842. Syst. ast., p. 113. Koehler, 1904. Mem. Soo. 



zool. France, 17, p. 77, f. 33-35. 



1 specimen. Dutch East Indies : Banka Strait. 



824. O. GALAPAGENIS Lutken and Mortensen, 1899. Mem. M. C. Z., 23, p. 181, pi. 20, f. 1-4, 



1 COTYPE. Near Galapagos Islands, 53 fms. 



825. O. GALATEAE UJtken, 1872. Ov. Kongl. Danske vid. selsk. Forh., p. 90, 108. 



1 specimen. Phihppine Islands. 



826. O. HIRSUTA Mtjller and Troschel, 1842. Syst. Ast., p. 111. Duncan, 1887. Journ. Linn. 



soc. Zool., 21, pi. 9, f. 18, 19 (as 0. variabilis). 



38 specimens, including holotype and 2 paratj^ies of 0. cheneyi Lyman. 

 Red Sea. Zanzibar. Philippine Islands. West AustraUa: Sharks Bay. Torres 

 Strait: Murray Islands, Mer. 



827. 0. HYBRIDA, sp. nov. Plate 12, f. 5. 



Disk 8 nun. in diameter; arms 55-60 mm. long. Disk covered with a coat 

 of scales, each of which carries a slender, acute spine about .4-.5 mm. long; 

 these spines are not perfectly smooth but they are not very thorny. Radial 

 shields large, bare, and smooth, separated radially by a series of spine-bearing 

 plates. Upper arm-plates nearly twice as wide as long, broadly in contact; 

 proximal margin straight, much shorter than distal, which is broadly curved or 

 may be angularly bent on each side. Oral shields longer than broad, or at least 

 as long, somewhat pentagonal with rounded corners or bud-shaped, with concave, 

 proximal margins. Adoral plates large, usually in contact proximally. Under 

 arm-plates squarish with corners rounded, broadly in contact, becoming dis- 



