186 



liite want of iiuy pigmentary ramifications on the cephalon may serve for 

 distinguishing this form from the type species. 



Occurrence. — Of this species a single specimen, tlie one here figured, 

 was collected long ago, by the author, off the Lofoten Isles. Another speci- 

 men, preserved in the Stockholm Museum, was taken by v. Ylilen, on the 

 great fishing banks outside the coast of Finmark. Finally, a few specimens 

 were procured during the Norwegian North Atlantic Expedition in H different 

 Stations, at depths varying from 70 to 148 fathoms, but were at that time 

 erroneously determined as li- Gaimardii. 



Ditt/rihufion. — The Barents Sea, south coast of Spitsbergen (Norw. 

 North Atlantic Expedition). 



16. Byblis affinis, G. O. Sars, n. sp. 



(PI. 6.5, fig. 2). 



Body somewhat shorter and .stouter tlian in the 2 preceding species. 

 Ceplialon with the frontal pai't but little produced, tip transversely truncated, 

 with the lower corners distinctly angular, inferior edge beliind the latter 

 rather convex. First pair of eoxal plates not very much expanded distally. 

 Last pair of epimeral plates of metasome bluntly truncated at the lateral 

 corners. Corneal lenses smaller than in the 2 preceding species, the lower 

 pair remote from the inferior corners of the front, ocular pigment dark 

 brownish, with a somewhat lighter coating. Superior antennae in female 

 scarcely exceeding half the length of the body, peduncle reaching about to 

 the end of the inferior ones, flagellum twice the length of the peduncle, and 

 composed of about 24 articulations. Inferior antennae not twice as long as 

 the body, the 2 outer joints of the peduncle nearly equal-sized. Gnathopoda 

 comparatively feebler in structure than in the 2 preceding species, propodos 

 but little shorter than the carpus. Anterior pairs of pereiopoda with 

 the propodal joint considerably longer than the carpal one, and gradually 

 tapering distally, dactylus scarcely as long as the former. Last pair 

 of pereiopoda with the posterior expansion of the basal joint subtrun- 

 cated at the tip, though the anterior corner is rounded off, carpal joint about 

 as long as the 2 preceding joints combined, and armed with 4 slender spines 

 anteriorly, propodal joint somewhat shorter and much narrower. Last pair 

 of uropoda with the rami slightly serrated on their opposite edges, inner 

 ramus armed inside with 4 denticles. Telson nearly as long as it is broad 

 at the base, very slightly narrowed distally, tip transversely truncated, 

 with 2 small apical spinules, cleft almost extending to the middle, and very 

 narrow, fissure-like. Body pellucid, with reddish intestine shining through 



