191 



Superior antennae in female extremely small, about as long as the ceplialon 

 and the first 2 segments of mesosome combined, and scarcely reaching beyond 

 the peniiltimate peduncular joint of the inferior ones, flagellum shorter than 

 the peduncle, and only composed of G articulations. Inferior antennae scarcely 

 exceeding half the length of the body, last joint of the peduncle shorter 

 than the penultimate one. Gnathopoda of the usual structure, the posterior 

 ones more slender and elongated than the anterior. Last pair of pereiopoda 

 with the posterior expansion of the basal joint rather large and broad, 

 reaching about to the end of the carpal joint, and obtusely truncated at the 

 tip, anterior corner rounded off; carpal joint scarcely longer than the 2 pre- 

 ceding joints combined, and having but 2 fascicles of spines anteriorly, propodal 

 joint about the same length, but, as usual, much more slender. Last pair of 

 uropoda with the rami comparatively short, and without any distinct serra- 

 tions, the outer one exhibiting only, on the inner edge, somewhat anterior 

 to the middle, a single dentiform projection, inner ramus with only 2 marginal 

 denticles. Telson subquadrangular in form, nearly as long as it is broad at 

 the base, tip truncated, and armed with a pair of apical spinules, cleft 

 extending about to the middle. Body highly pellucid, and nearly colourless. 

 Length of adult female 8 mm. 



Ecmarls. — This form was erroneously described by the author as 

 an Ampclisca. It is however quite assuredly a true Byhlh, though exhibiting 

 a less slender form than usual. The extremely small superior antennae will 

 at once serve for recognition of the present .species, which thus justly bears 

 its specific apellation. 



Occurrence. — Several specimens of this species were collected during 

 tlie Norwegian North Atlantic Expedition in as may as 6 different Stations, 

 and at depths varying from 350 to G34 fathoms. Five of these Stations were 

 located outside the great fishing banks off the west and north coast of Norway, 

 and hence the species may perhaps be referred to the fauna of Norway. 



Bisiribidion. — Spitsbergen (Norw. North Atlant. Exped.). 



Gen. 3. HaploopS, Lilljeborg, 1855. 



Body, as a rule, more robust than in the genus Byblis, and more 

 like that in Ampelisca. Cephalon with the frontal part less produced, post- 

 antennal corners rounded oft'. First pair of coxal plates rather large, deeper 

 than the succeeding ones, and gradually expanded, distally, terminal edge 



