161 



in shape, terminal part comparatively short and produced at each extremity, 

 anterior lappet obtuse at the end, posterior acuminate. 



Colour of shell dull brownish, limbs bright yellow. 



Length of adult female 0.75 mm., of male 0.81 mm. 



Remarks. The present species is nearly allied to C. papillosa, but easily 

 distinguished by the somewhat different shape of the shell, the surface of which 

 is of a much more dull appearance, with the papillae far less conspicuous. It was 

 described by me in the year 1865 under the -name of Cyprideis proximo,; but 

 both the generic and the specific names are to be changed as above. 



Occurrence. This species is rather common in the upper part of the 

 Christiania Fjord, and I have also taken it in several other places on our coast, 

 up to the Lofoten islands. Norman has recorded it is far North as Vadso, 

 East Finmark, and the distribution of this form around the whole of the Nor- 

 wegian coast is thus ascertained. It occurs generally in depths of 620 fathoms 

 on a muddy bottom, often associated with C. papillosa. Owing to the more 

 firm consistency of the shell, it is never found, like the last named species, 

 floating on the surface of the water. 



Distribution. British Isles, Iceland, Baffins Bay, Spitsbergen, Bay of St. 

 Lawrence, Franz Josef Land. 



Fossil. Norway, British Isles (glacial and postglacial). 



Gen. 34. Eucythere, Brady 1866. 



Syn : Cytheropsis, G. O. Sars. 



Generic Characters.-- Shell more or less triangular in shape, much higher 

 in front than behind, and rather compressed in its anterior part. Valves thin 

 and pellucid, with the surface evenly convex and adorned with scattered more 

 or less conspicuous flattened tubercles or papillae, as in Cytheridea; hinge rather 

 imperfect; inner duplicatures comparatively broad anteriorly; marginal zone 

 broad, and crosed by distant pore-channels, edges smooth with scattered hairs. 

 Eyes coalesced. Anterior antennae less robust than in Cytheridea, with the 

 terminal joint more prolonged. Posterior antennae with the flagellum well 

 developed in both sexes. Vibratory plate of mandibular palp very small. 

 Maxillae with the innermost masticatory lobe much reduced, palp with the 

 distal joint long and narrow. Legs rather feeble, not transformed in male. 

 Brush-like male appendages peculiarly developed. 



Remarks. This genus was established in the year 1865 by the present 

 author; but as the name Cytheropsis proposed had been preoccupied, it was 



20 Crustacea. 



