127 



has never been met with suhsequently off the coast of Norway, whereas it 

 lias turned out to be a genuine arctic form. 

 Distrihittion. — Greenland (Hansen). 



Gen. 3. Bathyporeia, Lindstrom, 1855. 

 Syn; Thersites, Sp. Bate. 



Body compressed, glabrous, with the metasome powerfully developed, 

 especially in the male. Cephalon truncated in front. Coxal plates not very 

 large; 1st pair much smaller and narrower than the rest, and turned nearly 

 straight forwards; the 3 succeeding ones subtruncated at the tip, which is 

 densely setous ; 4th pair slightly emarginated posteriorly ; 5th pair rather 

 broad, though less deep than the ])receding ones, posterior lobe the larger. 

 Su])erior antennae shorter than the inferior, 1st joint of the peduncle very 

 large and thick, clavate, produced in front to a blunted projection overhanging 

 the remaining part of the peduncle; accessory ajopendage small, biarticulate, 

 1st joint spinous, 2nd very narrow, setiform; flagellum in male somewhat 

 coarser than in female, and furnished posteriorly with transverse rows of 

 delicate cilia, anteriorly with a single row of calceolee. Inferior antennae 

 I'atlier slender, with the penultimate joint of the peduncle the largest; flagel- 

 lum in female shorter than the peduncle, in male more or less elongated, 

 filiform, and furnished with distinct calceolse. Mandibles witli the cutting- 

 edge unusually pi'oduced, lamellae not dentate, molar expansion well developed, 

 intermediate spines few in number ; palp cixrved with the terminal joint rather 

 narrow. First pair of maxillae with the terminal joint of the palp incurved, 

 and densely liairy in its outer ])art, Ijasal lobe about as in PriscUla. Second 

 pair of maxillae as in the latter genus. Maxillipeds, with the masticatory 

 lobe comparatively short and coarsely spinous on the inner edge, palp rather 

 large, with the antepenultimate joint obtusely produced at the end inwards 

 and clothed with numerous transverse rows of very delicate long cilia, penul- 

 timate joint much constricted at tlie base, and abruptly incurved distalh-, 

 dactylus small. Gnathopoda rather unequal both as to size aiul structure : 

 the anterior ones very small and scarcely subcheliform, propodos oval; the 

 posterior much more powei'ful and densely setoxis, propodos spathulate, having 

 a dense brush of diverging setae instead of the dactylus. The 2 anterior pairs 

 of pereiopoda comj)aratively short and stout. The 3 posterior pairs rather dissi- 

 milar; antepenultimate pair more or less bent in a sigmoid manner, basal joint 

 laniiiiiir, constricted at the base, nieral joint greatly exjjanded and densely 



