NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 263 



record may well be regarded as very doubtful, at least until the 

 species is reported from Alaska. 



OPHIOTHRIX LONGIPEDA. 



Ophiura longipeda LAMARCK, Anim. s. Vert., vol. 2, 1816, p. 544. 

 ' Ophiothrix longipeda MULLER and TROSCHEL, Sys. Ast., 1842, p. 113. 



Locality. Ousima, Japan, 3 specimens. 



Two of these specimens are very large, having a disk diameter of 

 30 mm. and arms 

 645 mm. long; the 

 arms are thus more 

 than twenty - one 

 times the disk di- 

 ameter. 



OPHIOTHRIX HYLODES, 

 new species." 



Disk 10 mm. in 

 diameter; arms 

 about 45 mm. long. 

 Disk thickly cov 

 ered with stout 

 blunt, rough spines, 

 which are of nearly 

 uniform length. 

 Radial shields mod- 

 era te, triangular, 

 much longer than 

 wide, well sepa- 

 rated ; they carry 

 many of the disk 



spines but although FlG - I SO. OPHIOTHRIX HYLODES. x 5. a, FROM ABOVE; 6, FROM BE- 



. ! . , . LOW; C, SIDE VIEW OF TWO ARM JOINTS NEAR DISK. 



their outlines are 



thereby obscured the distal portion is nearly bare. Upper arm 

 plates rounded hexagonal or rhombic, wider than long. Oral sur- 

 face with no characteristic features. Arm spines about eight in 

 number, of moderate length, rough, blunt, and somewhat flattened. 

 Color (dried from alcohol), variable; in type, disk and oral surface 

 brown; arms dull purplish with a longitudinal light stripe more 

 or less clearly indicated; in other specimens, disk pale brown or 

 greenish, arms greenish, with longitudinal light stripe very faintly 

 indicated. 



Localities. Misaki, Japan, 2 specimens; Ayukawa, Japan, 1 speci- 

 men. " Northwestern Pacific, probably Japan," 1 specimen. 



Type. Cat. No. 25723, U.S.N.M., from Misaki. 



, signifying wooded, in reference to the thick covering of spines on the disk. 



