NO. 1701. 



NORTHWEST PACIFIC ISOPODS— RICHARDSON. 



77 



at Sudzii Misaki Light, N. 68° W., 24 miles (lat. 37° 22' 30" N.; long. 

 137° 47' E.) at a depth of 619 fathoms in green mud. 

 Type-S'pecimen.— Cut No. 39496, U.S.N.M. 



Family ANTHURID.^. 



Genus PARANTHURA Bate and Westwood. 



PARANTHURA JAPONICA, new species. 



Body narrow, elongate. Color, in alcohol, yellow, Avith irregular 

 markings of black. 



Head about as long as wide, 1 mm. : 1 mm. Anterior margin exca- 

 vate and with a small median point. Eyes rather large, round, com- 

 posite and placed in the antero-lateral angles. 

 The first pair of antennse have the first article of 

 the peduncle elongate; the second and third are 

 subequal in length, and both together are not 

 longer than the first article; the flagellum con- 

 sists of four articles, the last of which is minute. 

 The second pair of antenna} have the second article 

 elongate; the third and fourth short and subequal, 

 and both together not longer than the second ; the 

 fifth is about one and a half times longer than the 

 fourth; the flagellum consists of a single, taper- 

 ing article, furnished with hairs. 



The first five segments of the thorax are sub- 

 equal in length, each being 1| mm. long. The 

 sixth segment is shorter, being only 1 mm. long. 

 The seventh is half as long as the sixth, being 

 The first five segments of the abdomen taken together are equal in 

 length to the sixth thoracic segment. These seg- 

 ments are all fused in the middle of the dorsal 

 region but are distinct at the sides. The sixth 

 segment is almost as long as half the length of 

 the other five segments taken together. The 

 telson is liguiform, with the posterior extremity 

 rounded. The peduncle of the uropoda extends 

 about three-fourths the length of the terminal 

 abdominal segment. The inner branch is short, 

 rounded posteriorly, and does not extend be- 

 yond the extremity of the terminal abdominal 

 segment. The outer branch arches over the 

 telson and is as long as the peduncle of the 

 uropoda. 



The first three pairs of legs are prehensile, 

 the first pair being stouter and larger than the others. The last 

 four pairs are ambulatory. 



Fig. 4. — Paraxthuea 

 JAPONICA. Head 



AND FIRST THREE 

 SEGMENTS OF 

 THORAX. X 91. 



mm. in length. 



Fig. 5. PARANTHURA 



JAPONICA. Last 



FOUR SEGMENTS OF 

 THORAX AND ABDO- 

 MEN. X 91. 



