NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 271 



Type.C&t. No. 25714, U.S.N.M., from station 4933. 



There may be some question whether the webbed arm spines are 

 not sufficient to remove this species from Ophiobyrsa, but the upper 

 arm plates, disk covering, mouth parts, and lack of tentacle scales 

 seem to me sufficient reasons for placing it in that genus. The 

 smooth upper surface of the arms, plus the webbed arm spines, will 

 serve to distinguish synaptacantha from the other members of the 

 group. 



OPHIOMYXA AUSTRALIS. 

 Ophiomyxa australis LUTKEN, Add. Hist. Oph., pt. 3, 1869, p. 45. 



Localities. Albatross station 3757, off Suno Saki, Honshu Island, 

 Japan, 41 to 50 fathoms, coarse coral sand, gravel, 8 specimens; 

 station 4880, Korea Strait, lat. 34 16' N.; long. 130 16' E., 59 

 fathoms, fine gray sand, broken shells, bottom temperature 62.1, 

 1 specimen; station 4894, Eastern Sea, lat. 32 33' N.; long. 128 32' 

 10" E., 95 fathoms, green sand, broken shells, pebbles, bottom tem- 

 perature 55.9, 2 specimens; station 4895, Eastern Sea, lat. 32 33' 10" 

 N.; long. 128 32' 10" E., 95 fathoms, green sand, broken shells, 

 pebbles, bottom temperature 55.9, 1 specimen; station 4936, Eastern 

 Sea, lat. 30 54' 40" N.; long. 130 37' 30" E., 103 fathoms, stones, 

 bottom temperature 60.6, 2 specimens. Bathymetrical range, 41 

 to 103 fathoms. Temperature range, 62.1 to 55.9. Fourteen 

 specimens. 



These specimens range in disk diameter from 6 to 20 mm. and 

 vary in color from light gray or yellowish to deep brown. The num- 

 ber of arm spines varies from four .(rarely three, often five) in small 

 individuals to six, sometimes seven, in large ones. * 



OPHIOMYXA ANISACANTHA, new species, o 



Disk 20 mm. in diameter; arms about 120 mm. long. Similar to 

 australis, except that the disk skin is thinner and the marginal scales 

 are wanting; the oral papillae are smaller, especially the outermost, 

 which are smallest, and are well spaced; and the arm spines are 

 longer and fewer, three (rarely two, often four) in small individuals 

 and four (very rarely five) in large ones ; uppermost spine largest and 

 stoutest next lower shorter and somewhat more slender; third very 

 slender, about equal to second; lowest as long as or longer than 

 uppermost, but very much more slender. Color (dried from alcohol), 

 ranging from nearly white to dull reddish-brown. 



Localities. Albatross station 3749, off Suno Saki, Honshu Island, 

 Japan, 83 to 158 fathoms, black sand, shells, 11 specimens; station 

 4892, Eastern Sea, lat. 32 27' 30" N. ; long. 128 33' E., 181 fathoms, 

 gray sand, broken shells, rocks, bottom temperature 50.2, 1 speci- 



""Aveooe, signifying unequal, and amvOa, signifying spine, in reference to the inequal- 

 ity of the arm spines. 



