190 



truncated at tbe lateral corners. Corneal lenses qnite wanting. Superior 

 antennse in female bnt little exceeding half the length of the body, peduncle 

 by far not reaching to the end of the penultimate peduncular joint of 

 the inferior ones, its 1st joint about half the length of the cephalon, 

 flagellum fully twice as long as the peduncle, and composed of about 

 28 articulations. Inferior antennse nearly twice as long as the superior, 

 last joint of the peduncle considerably shorter than the penultimate one. 

 Gnathopoda about as in the two preceding species. Last pair of pereiopoda 

 with the posterior expansion of the basal joint broader than in 7?. crassi- 

 cornis, and somewhat projecting beyond the meral joint, anterior and inferior 

 edges forming together a strong curve; carpal joint fully as large as the 

 2 preceding joints combined, and having anteriorly G spines, propodal joint a 

 little shorter, dactylus scarcely more than half as long. Last pair of uropoda 

 with the outer ramus having only 3 serrations interiorly, the inner distinctly 

 serrated on the opposite edge, and having besides 4 rather coarse denticles. 

 Telson broader than it is long, nearly quadrangular in form, outer part biit 

 little narrowed, and transversely truncated at the tip, which is provided 

 with 2 slender spinules, cleft very small, nearly obsolete. Body whitish, 

 pellucid, without any distinct colouring. Length of adult female 12 mm. 



Ilemarlcs. — This species agrees with B. crassicornis in the absolute 

 want of any corneal lenses, bnt may readily be distinguished from that 

 species, by the diiferent longitudinal relation of the two pairs of antennse, 

 as also by several other structural details mentioned in the above diagnosis, 

 not to speak of its much larger size. 



Occurrence. — Three specimens of this species were collected during 

 tlie Norwegian North Atlantic Expedition in 3 difterent Stations, all lying 

 outside the west and north coast of Norway, depth from 350 to 630 fathoms. 

 It may thus perhaps properly be referred to the faiina of Norway. 



20. Byblis minuticornis, G. 0. Sars. 



(PI. 66, fig. 3). 

 Ampelisca minuticornis, G. O. Sars, Crust, it Pycnogouida nova etc. No. 32. 



Form of body somewhat shorter and .stouter than in the 2 preceding 

 species. Cephalon about equalling in length the 3 anterior segments of 

 mesosome combined, frontal part rather produced, and narrowly truncated 

 at the tip, lower cornei's but very little projecting. First pair of coxal plates 

 rather expanded distally, terminal edge obliquely rounded, and finely serrated 

 between the marginal setse. Last pair of epiraeral plates of metasome 

 obtusely truncated at the lateral corners. Corneal lenses quite wanting. 



