127 



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

 has turned out to be a genuine arctic form. 

 Distribution. - - Greenland (Hansen). 



Gen. 3. Bathyporeia, Lindstrom, L855. 

 Syn: Thersites, Sp. Bate. 



Body compressed, glabrous, with the metasome powerful! v developed, 

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

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

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

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

 broad, though less deep than the preceding ones, posterior lobe the larger. 

 Superior antenna 3 , 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 appendage sm all, biarticulate, 

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

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

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

 rather 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 calceola?. Mandibles with the cutting 

 edge unusually produced, lamellae not dentate, molar expansion well developed, 

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

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

 and densely hairy in its outer part, basal lobe about as in Prisc/U/i. 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 the base, and abruptly incurved dislally. 

 dactylus small. Gnathopoda rather unequal both as to si/e and structure: 

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

 posterior much more powerful and densely setous, propodos spathulate, having 

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

 of pereiopoda comparatively short and stout. The 3 posterior pairs rather dissi- 

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

 laminar, constricted at the base, meral joint greatly expanded and densely 



