39 



bristle comparatively short. Anterior antennae somewhat thickened at the base, 

 and only 22-articulate. Masticatory part both of the mandibles and maxilla 

 obsolete. Anterior maxillipeds extremely small and rudimentary. Posterior max- 

 illipeds likewise much smaller than in female, spines of the terminal part trans- 

 formed to flexible ciliated setae. 1st pair of legs with the outer ramus distinctly 

 3-articulate. Last pair of legs considerably exceeding the urosome in length, left 

 leg with the hand shorter than the preceding joint and slightly widening distally, 

 with the inner edge coarsely dentate, thumb produced to a sharp unguiform point, 

 dactylus short, with a brush of hairs inside the tip, appendicular lappet obtusely 

 rounded. 



Colour. Body pellucid, with the oral region more or less deeply tinged 

 with crimson ; ova in the ovisac dark blue. Caudal setae with the cilia beautifully 

 iridescent. 



Length of adult female about 8 mm., of male 7 mm. 



Remarks. This form was first recorded by Boeck from the Norwegian 

 coast, but at first erroneously identified with E. Prestandrece, Philippi (= E. marina 

 Prestandrea), which species does not occur in the northern Ocean. The form 

 recorded by Moebius as E. carinata, is unquestionably identical with Boeck's 

 species. On the other hand, the form described and figured by the present 

 author, in his account of the Crustacea of the Norwegian North Atlantic Expedition, 

 as E. norvegica, Boeck, is not that species, but a nearly allied form, E. barbata, 

 Brady; and the form recorded from Nansen's Polar Expedition under the same 

 name, has also, on a closer examination, turned out to be a different species, viz., 

 E. glacialis, Hansen. Both these species are now proved to belong to the fauna 

 of Norway, and will be described below. The present species is chiefly charac- 

 terised by its unusually slender body, the form of the genital protuberance in the 

 female, and the structure of the hand in the last left leg of the male. 



Occurrence. I have found this handsome Calanoid rather frequently along 

 the whole Norwegian coast, from the Christiania Fjord to Vadso, especially in 

 the great depths of the fjords. At times, however, it also ascends nearer to the 

 surface, and in the several proofs of plankton taken during the cruise of the 

 "Michael Sars" in the open sea, it was by no means unfrequent. Male specimens 

 are not infrequently found, and are at once recognized by their extremely slender 

 body and the largely developed last pair of legs. 



Distribution. Occasional in two different places in the polar basin crossed 

 by Nansen, 



