342 



at the tip 2 very long and slender setae. Inferior antennae in female much 

 shorter than the superior, with the basal part rather thick, last joint of the 

 peduncle not attaining the length of the penultimate one, flagellum about 

 the length of those joints combined. Anterior gnathopoda with the propodos 

 much longer than the carpus, oblong oval in form, and gradually expanded 

 to about the middle, palm somewhat arched and about the length of the hind 

 margin, carpal lobe rather large and pointing obliquely forwards. Posterior 

 gnathopoda a little more slender than the anterior, propodos more elongated, 

 and nearly as long as the 3 preceding joints combined, its palm shorter 

 than the hind margin, carpal lobe very narrow, and scarcely extending to 

 the palm of the propodos. The 2 anterior pairs of pereiopoda very large and 

 powerfully developed, meral joint much expanded distally, and having outside 

 an obliquely curved ridge, edged with a dense row of strong setse, carpal joint 

 short and broad, nearly heart-shaped, forming posteriorly a rounded expansion, 

 edged with strong spiniform setae, propodal joint gradually expanded distally, 

 and forming in front of the insertion of the dactylus an obtusely rounded 

 expansion edged with fascicles of slender bristles, dactylus very large and 

 foliaceous. The 2 succeeding pairs much smaller, and rather feeble, subequal 

 both in size and structure, with the basal joint nearly linear in form and 

 the dactylus rather slender. Last pair of pereiopoda equalling about 3 /4 of 

 the length of the body, basal joint rather large and oval in form, carpal 

 joint much shorter than the meral one. Last pair of uropoda with the rami 

 longer than the basal part, and narrowly lanceolate in form, each edged with 

 a few slender spinules. Telson quadrangular in form, scarcely longer than 

 it is broad, and transversely truncated at the tip. Colour in the living state 

 of the animal not yet stated. Length of an apparently young female 

 specimen 5 mm. 



Remarks. - There cannot, I think, be any doubt that the form here 

 described is identical with the Aceros distingvendus of Hansen, which latter 

 species is considered by that author to be the supposed variety recorded 

 by Goes as (Ediceros 6btu*n*, alia forma. The very peculiar develop- 

 ment of the 2 anterior pairs of pereiopoda, in connexion with the structure 

 of the superior antennae, will suffice to distinguish this form from any of the 

 other (Ediceridae. 



Occurrence. I have hitherto only met with a single specimen of this 

 remarkable form, the one here described and figured, apparently a young 

 female specimen. It was collected, many years ago, in the Varangerfjord 

 from a depth of 80 100 fathoms. 



Dint rilntt ion. Spitsbergen (Goe's), the Kara Sea (Hansen), Greenland 

 (Hansen). 



