4fi8 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



post-lateral angles are acutely produced l)ut 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 onl}^ specimen. 



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

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

 duced as in Janirojms Sars. 



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

 Dall at Constantine Ba}^ 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" related to lolella hohnesi (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. Ct. O. Sars, the distinjjuished 

 carcinologist, for whose courteous and generous permission to repro- 

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



75. Genus J AN IRA 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 comparitivel}' small rostrum. 



First pair of antenna? well developed, with the tlagellum multi- 

 articulate. Second antennt\^ vei'v 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 i)eduncle and the branch of the first 

 pleopoda of the male not dilated at the tip. 



Uropoda largel}' developed. 



First pair of legs prehensile in ])oth sexes; dactylus in all the legs 

 tri-unguiculate. 



Terminal segment of the ])<)dy rounded, not expandc^d laterall}'. 



ANAi.YTICAI. KP:Y TO THE SrEClES OF THE GEM'S .JAXIRA. 



<t. Anterior niarfiin of the heail .straight. 



1). First pair of legs alike in lioth sexes, witli earjjiis large, siibfusiforin, and edged 

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

 coarsely serrated. I'ipimera bilobed JuDira maculosa Leach 



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



