34 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVII. 



the first joint of the peduncle is entirely concealed by the frontal 



process; the flagolluin consists of fourteen joints. 



The first and second segments of the thorax are equal in length. 



The third is longer and the fourth the longest. The fifth segment is 



i^hort and equal in length to the first or second segment. The sixth 



segment is very short in the median dorsal 

 line, being about one-third the length of the 

 preceding segment. The seventh segment is 

 extremely short, being half as long in the 

 median line as the sixth segment. The epi- 

 mera of the second and third segments are not 

 so acutely produced as in the following seg- 

 ments. Those of the fourth, fifth, and sixth 

 segments are narrow and have acute posterior 

 extremities. The epimera of the seventh seg- 

 ment are broad, but also acutely produced. 



The first abdominal segment is not evident 

 in a dorsal view", being entirely concealed 

 by the last thoracic segment. The second, 

 third, and fourth segments are produced 

 laterally in acute processes. The fifth seg- 

 ment is narrow, not as wide as the terminal 

 segment, but is longer than the preceding 

 segments in the median line. The terminal 

 segment is roundly triangulate, with margins 



fringed with a few hairs. The outer branch of the uropoda is broadl}^ 



expanded, rounded posteriorly, and is about twice as wide as the inner 



branch. The outer margin is crenulate, and beset with ten spines. 



The inner branch is narrow, and rounded posteriorly, and is equal in 



length to the outer branch. 



The first three pairs of legs have long curved dactyli. The pro- 



podus of the fi]'st pair is armed with four spines, 



the carpus with one, and the nierus with two. 



The second and third pairs have the propodus 



armed with only three spines. The other legs are 



long, slender, and somewhat spinulose. 



Only one specimen was taken by the U. S. Fish 



Commission steamer AlJjotro.s.s^ at the entrance 



of Port Heda, Japan, at a depth of 167 fathoms. 

 Tijj^e.—Cut No. 29083, U.S.N.M. 

 This species is very closelv related to i?. oculata Harger," to which 



it bears a very striking resemblance. It dift'ers from that species in 



the following points: 



«Bull. Mus. Comp. Zool., Harvard College, XI, No. 4, 1883, pp. 97-98; pi. in, 

 figs. 2-2a; pi. iv, fig. 1. 



-ROCINELA AFFINIS, NEW 

 SPECIES. X 4. 



Fig. 2.— Leg of first pair 

 of rocinela affinis. x 10. 



