206 



able want of correctness, as regards the said author, had not been universally known. 

 \Ve also see, that M.M. Giard '& Bonnier, who may be presumed to have ex- 

 amined the species of Hesse, do not doubt that Pltri/.nis longibranchiatus of Sp. 

 Bate & Westw., one of the species here described, is congeneric with Pleuro- 

 ci-f/jtta yi.tlathece Hesse; they even regard this form as merely the young female 

 (,,phryxoid stage") of Hesse's species, an opinion which I, however, am not 

 prepared to endorse. Three different species of this genus have hitherto been 

 stated to belong to the fauna of Norway, and they will be described and figured 

 in this work. 



1. Pleuroerypta longibranehiata, (Sp. Bate & Westw.). 



(PI. LXXXVI. tig. a). 



Phri/xus longibranchiatus, Sp. Bate & Westwood. Brit, sessile-eyed Crust. 



Vol. II, p. 246. 



Specific Characters. Body of female but slightly asymmetrical, oblong 

 pyriform in outline, being gradually narrowed behind. Cephalon of moderate 

 size, frontal edge strongly curved, lateral corners somewhat produced. Segments 

 of mesosome well defined, with the lateral parts slightly elevated, coxal plates 

 forming a somewhat discontiguous border flanking the sides. Epimeral plates of 

 metasome narrow lanceolate, discontiguous. Eyes small, but distinct. Antennae 

 shorthand thick, subequal in size. Terminal joint of maxillipeds conical in form, 

 setous on both edges.", 1st pair of incubatory plates with the distal segment 

 deeply emarginate ^outside; the succeeding pairs large, overlapping each other 

 in the middle. Legs~sruall, scarcely projecting laterally. Pleopoda rather fully 

 developed and projecting far beyond the epimeral plates, lamelhe narrow lanceo- 

 late and very distinctly tuberculated. Uropoda of about the same length as the 

 lamellae of^the^ pleopoda, but much narrower. Male somewhat depressed, with 

 the mesosome^ of nearly uniform width throughout, metasome forming an un- 

 divided piece, rather broad at the base and gradually tapering to an obtuse 

 point. Colour not yet stated. Length of female 8 mm., of male 2 mm. 



Kern uric*. I cannot doubt that the above-described form is identical 



with that described in Brit- sessile-eyed Crust, as Phryxus longibranchiatus. The 

 general form of the body is the same, and the structure of the pleopoda seems 

 also to agree perfectly, well. The statement of the British authors that the last 

 segment of the metasome carries 4, instead of 2 appendages, is certainly due to 

 a miscomprehension, and may easily be explained by the close resemblance of 



