256 RECENT OPHIURANS. 



radial lobes and closely covered with a coat of small, but not delicate scales; 

 there are about 30 series from center to interradial margin, about 14-16 across 

 an interradial area, between the proximal ends of the radial shields and about 

 30 series across an interradial lobe. Radial shields very small (hence the name), 

 1 mm. long by .25-.30 mm. wide, parallel, near together but separated by 

 a thin line of scales. Upper arm-plates short and wide, and in contact for 

 the full width, which is about 3 times the length. Interbrachial areas below 

 with a firm coat of very minute scales. Oral shields lens-shaped, nearly twice 

 as long as wide. Adoral plates of moderate size, meeting within. Oral papillae, 

 4 or 5 on a side, small and not at all distinctive. Under arm-plates nearly rec- 

 tangular, wider than long (often very much so), in full contact. Side arm-plates 

 low and not significant; each carries, 3, 4 or .5 short (scarcely equal to joint), 

 subequal, not slender, blunt arm-spines; only on the basal part of the arm are 

 more than 3 spines present in a series, and only on two or three joints, of each 

 arm, are there five. Tentacle-scales 2, very large, nearly or quite equalling those 

 of megapomus. Color in life: — pale fawn-color with patches of orange-brown, 

 arms whitish; (dried from alcohol), pale grayish yellow. 



HoLOTYPE (M. C. Z. no. 3742). Torres Strait: Badu. Nov. 1, 1913. 

 Carnegie exp. 1913. F. A. Potts coll. 



Although this specimen shed its disk after capture, it is practically uninjured 

 for descriptive purposes. It was taken on the under side of a coral fragment 

 in 5-6 feet of water. It is readily distinguishable from all other species of the 

 genus by the exceedingly small radial shields. 



696. A, PATULUS (Lyman). 



Amphiura patula Lyman, 1879. Bull. M. C. Z., 6, p. 31, pi. 12, f. 335-3.37. 

 Amphioplus patula Veerill, 1899. Trans. Conn, aead., 10, p. 315. 



1 coTYPE. Antarctic Ocean, southwest of Australia, 1975 fms. 



697. A. RELICTUS (Koehler). 



Amphiura relida Koehler, 1898. Bull, sci., 31, p. 68, pi. 4, f. 37, 38.' 



2 specimens. Amboina. Torres Strait: off Goode Island, 2-3 fms. 



698. A. RHADINOBRACHIUS H. L. Clark, 1911. Bull. 75 U. S. N. M., p. 167, f. 74. 



5 specimens, including 1 paratype. Japan: Sagami Sea, 200-405 fms. 



' This seems to be identical with Ophiophragmu^ affinis Duncan, 1886, which is clearly an Amphio- 

 plus; but as Duncan's name cannot be used, since it is preoccupied by Studer's (see no. 701), Koehler's 

 name is to be retained. 



