I8OPODS OF NOKTH AMERICA. 469 



l>'. First pair of legs unlike in the two sexes, though prehensile. In male the car- 

 pus of the first pair of legs is large and produced on the inside at its outer 

 distal end in a long acute process, between which and the articulation of the 

 propodus are two long acute processes about half as long as the outer process. 

 Distal part of lateral margins of terminal segment of body not serrated. 



Epimera single lobed Janira minuta Richardson 



a'. Anterior margin of the head not straight. 

 b. Front of head trilobate, the central lobe subacute, rather longer than others, 



but not rostrate Janira occidentalis Walker 



V . Front of head produced in the middle in a short, sharp rostrum, and the antero- 



lateral angles of the head also produced. 



c. Antero-lateral angles of head sharp. Lateral margins of first four thoracic 

 segments obtusely incised, each showing two broad angulations. Uropoda 

 of female shorter than half the terminal segment; those of male as long as 



terminal segment of body Janira tricornis (Kr0yer) 



c'. Antero-lateral angles of the head very slightly produced and rounded. Mar- 

 gins of the first thoracic segment rounded, not emarginate. Uropoda alike 

 in the two sexes, and longer than the terminal segment of the body. 

 Abdomen serrate on posterior half of lateral margin . . Janira alta ( Stimpson ) 



JANIRA MACULOSA Leach. 



Janira maculosa LEACH, Edinburgh Encyclop., VII, 1813-14, p. 434. 



Oniscoda maculosa LATREILLE, Cuvier's Regne Anirn., 2d ed., IV, 1829, p. 141. 

 MILNE EDWARDS, Hist. Nat. Crust., Ill, 1840, p. 151. 



Henopomus muticus KR0YER, Voy. en Scand., Crust., 1849, pi. xxx, figs, la-n; 

 Nat. Tidsskr. (2), II, 1846-49, p. 366. BATE and WESTWOOD, British 

 Sessile-eyed Crust., II, 1868, pp. 338-340. HANSEN, Vid. Medd. Naturh. 

 Foren. i Kj0bh., 1887-88, p. 190. SABS, Crust. Norway, II, 1899, pp. 99- 

 100, pi. XL. RICHARDSON, American Naturalist, XXXIV, 1900, p. 299; 

 Proc. U. S. Nat. Mus., XXIII, 1901, p. 555. 



Localities. Latitude 66 32' north, longitude 55 34' west; lati- 

 tude 72 32' north, longitude, 58 51' west; also, British Isles; Kat- 

 tegat; Dutch coast; coast of France; coast of Norway. 



Depth. SO to 116 fathoms. 



" Body oblong oval in form, about three times as long as it is broad, 

 and slightly narrowed both in front and behind. Cephalon with the 

 lateral expansions evenly rounded, frontal edge straight, without a 

 trace of rostrum. Anterior segments of mesosome with the lateral 

 parts slightly produced at both corners, but not covering the small 

 coxal plates, which are bi-lobate. Caudal segment sub-circular, distal 

 part of lateral edges coarsely serrated. Eyes well developed, rounded 

 oval, with dark pigment. Superior antennae reaching about to the 

 end of the penultimate peduncular joint of the inferior ones, flagel- 

 lum more than twice as long as the peduncle, and composed of about 

 thirty articulations. Inferior antennae considerably exceeding the 

 length of the body, the last two peduncular joints rather elongated, 

 subequal, flagellum about twice the length of the peduncle. Epignath 

 of the maxillipeds with the outer edge angular in the middle. First 

 pair of legs with the carpus about the length of the two preceding 



