337 



the joints; the superior ones in female scarcely more than twice as long as 

 the cephalon, 1st joint of the peduncle nearly as long as the other 2 com- 

 bined, flagellum longer than the peduncle, and composed of about 8 articu- 

 lations. Inferior antennae a little longer than the superior, the 2 outer joints 

 of the peduncle nearly equal-sized, flagellum about the length of those joints 

 combined. Gnathopoda somewhat resembling in structure those in B. longi- 

 manus; the anterior ones having, however, the carpus less elongated, and pro- 

 duced inferiorly to a rather projecting setous expansion narrowly rounded 

 at the tip, propodos longer than the carpus, and rather expanded distally. 

 Posterior gnathopoda much larger than the anterior, carpus produced inferiorly 

 in a manner similar to the latter, propodos oblong oval in form, exceeding 

 the carpus in length, and having the palm more than twice as long as the 

 hind margin, from which it is denned by a slight angle bearing an unusually 

 long and slender spine pointing anteriorly, dactylus very long and curved, 

 serrated on the inner edge. Pereiopoda much more strongly built than in 

 the 2 preceding species, and rather densely setous; propodal joint of the 2 

 anterior pairs about the length of the carpal one, dactylus of moderate length, 

 compressed lanceolate. The 2 succeeding pairs not very unequal in length, 

 and having the dactylus comparatively short. Last pair of pereiopoda 

 but little exceeding half the length of the body, basal joint rather large and 

 oval in form, carpal joint shorter than the meral one, which latter about 

 equals in length the propodal joint. Last pair of uropoda with the rami 

 nearly twice as long as the basal part, and narrowly lanceolate, each having 

 a few slender marginal spinules. Telson comparatively larger than in the 2 

 preceding species, and somewhat longer than it is broad at the base, outer 

 part slightly narrowed, and transversely truncated at the tip. Body pellucid, 

 whitish, with a faint yellowish tinge; ova in the marsupial pouch orange- 

 coloured. Length of adult female 5 mm. 



Remarks. I have formerly erroneously determined this form as Ha- 

 limedon Saussurei Boeck, and it was also described under this name by Mr. 

 Schneider in his admirable memoir on the northern (Ediceridae. It is, however, 

 very different from that species, though apparently congeneric. Dr. Hansen 

 subsequently described the same form from Greenland as a new species of 

 Halimedon, proposing for it the specific name of obt-usifrons, which thus ought 

 to be retained for the species. From the 2 preceding species this form is at 

 once distinguished by its much more robust form of body and the more 

 strongly built antennse and pereiopoda, moreover by the short and blunted 

 rostral projection and the rather conspicuous eyes. 



Occurrence. - I detected this form many years ago in the Varanger- 

 fjord, at Buge, where a few specimens were collected from a depth of about 



43 Crustacea. 



