468 BULLETIN o4, UNITED STATES NATIONAL MUSEUM. 



post-lateral angles are acutely produced but short. Between the post- 

 lateral angles the posterior margin is trilobate, the median lobe being 

 the largest, and not longer than the post-lateral angles. The margins 

 of the segment are beset with spines. 



The uropoda are lost in the only specimen. 



The distal extremity of the peduncle and the branch of the first 

 pleopoda of the male are fused and have the tip dilated and pro- 

 duced as in Janiropxis Sars. 



The type, a male, and the only specimen, was collected by Dr. W. H. 

 Dall at Constantino Bay, Amchitka Islands, Alaska, in 1873. Depth 

 8 fathoms. 



The type is in the U. 8. National Museum, Cat. No. 32076. 



This species is very closeh 7 related to loletta holmesi (Richardson), but 

 differs in the shape of the terminal abdominal segment, in having the 

 anterior angles of the first thoracic segment produced with the epi- 

 meron situated between the antero- and post-lateral processes, and in 

 having the lateral margins of the head but little produced and armed 

 with numerous spines. 



This species is named in honor of Prof. G. O. Sars, the distinguished 

 carcinologist, for whose courteous and generous permission to repro- 

 duce his plates in this work, I am most grateful. 



75. Genus JANIRA Leach. 



Body oblong, depressed. Lateral parts of head not produced or 

 but slightly produced. Eyes distinct, sub-dorsal. Front of head 

 obtuse or produced in a comparitively small rostrum. 



First pair of antennas well developed, with the flagellum multi- 

 articulate. Second antennas very much elongated, with scale outside 

 of third article of peduncle. Maxillipeds with the second and third 

 articles of the palp not expanded. 



Segments of thorax with lateral parts not produced into lappets. 



The distal extremity of the peduncle and the branch of the first 

 pleopoda of the male not dilated at the tip. 



Uropoda largely developed. 



First pair of legs prehensile in both sexes; dactylus in all the legs 

 tri-unguiculate. 



Terminal segment of the body rounded, not expanded laterally. 



ANALYTICAL KEY TO THE SPECIES OP THE GENUS JANIRA. 



a. Anterior margin of the head straight. 



b. First pair of legs alike in both sexes, with carpus large, subfusiform, and edged 

 inside with spines. Distal part of lateral margins of terminal segment of body 

 coarsely serrated. Epimera bilobed Janira maculosa Leach 



See Sars for characters of genus, Crust, of Norway, II, 1899, pp. 98-99. 



