RECENT OPHIURANS. 239 



the Pacific species marginatus but again the short arms distinguish it, whUe the 

 under arm-plates are also different. 



579. O. JAPONICUS Matsumoto, 1915. Proc. Acad. nat. sci. Phil., 67, p. 70. 



1 coTYPE. Japan: Kagoshima Gtjlf, 8-15 fms. 



580. O. WIIRDEMANII (Lyman). 



Amphiura wurdemanii Lyman, 1860. Proc. Boston soc. nat. hist., 7, p. 196. 



Ophiophragmus vjurdemaniihYMAN, 1865. Illus. cat. M. C. Z., no. 1, p. 12, 132. Koehler, 1914. 

 Bull. 84 U. S. N. M., pi. 8, f. 1, 2. 



21 specimens, including the holotype. North Carolina: shoals between 

 Beaufort and Fort Macon. Florida: Charlotte Harboh. 



Species of Ophiophragmus not represented in the M. C. Z. 



O. MARGINATUS (Ujtken), 1859. Add. ad hist. Oph., pt. 2, p. 119, pi. 3, f. 3a, b {Am- 

 phiura). Costa Rica: west coast, Punta Arenas. 



0. SEPTUS (LtJTKEN), 1859. Add. ad hist. Oph., pt. 2, p. 120 (Amphiura). 1872. Ov. 

 Kongl. Danske vid. selsk. Forh., pi. 2, f. 3a, h (Amphipholis) . Danish West Indies: St. 

 Thomas. 



Ophionephthys. 



LtJTKEN, 1869. Add. ad hist. Oph., pt. 3, p. 24, 25, 93, 98. 

 Type-species: 0. limicola Lutken, 1869. op. cit., p. 24, 25. 



583. O. ECNOMIOTATA (H. L. Clark). 



Amphiura ecnomiotata H. L. Clark, 1911. Bull. 75 U. S. N. M., p. 148, f. 59. 



1 specimen, and a fragment of the arm of the holotype. Japan: Mouth 

 of the Bay of Yeddo; off east coast, 31^1 fms. 



584. O. LIMICOLA LUtken, 1869. Add. ad hist. Oph., pt. 3, p. 24, 25, fig. 



3 cotypes, without disks. St. Thomas, D. W. I. 



585. O. OCTACANTHA, sp. nov. {dKroi, eight + aKai-Ba, spine). Plate 9, f. 9, 10. 



Disk 5 mm. in diameter but greatly shrunken in drying and its real measure- 

 ment when complete was certainly not less than 8 mm. .\i-ms all broken, but 

 evidently very long, probably 75 mm. at least. Disk naked save for a narrow 

 circle of very fine scales surrounding each radial shield except along the inner 

 distal margin where the two shields are in contact. Radial shields about 1.5 

 mm. long but not more than .4 mm. broad, in contact distally and very slightly 

 divergent thence proximally. Upper arm-plates very small, decidedly longer 



