190 



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

 antennae, in female but 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 antennae 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 fi. crci.^i- 

 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 but 

 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. 



Remark*. - - This species agrees with B. crassieornis in the absolute 

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

 species, by the different longitudinal relation of the two pairs of antennae, 

 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 

 the Norwegian North Atlantic Expedition in 3 different 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 fauna of Norway. 



20. Byblis minuticornis, G-. 0. Sars. 



(PI. 66, fig. 3). 

 Ampelisca minuticornis, G. O. Sars, Crust. & 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 corners 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 epimeral plates of metasome 

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



