355 



one replaced by a simple short seta. Maxillae and maxillipeds about as in Z. 

 typica. Natatory legs, however, more strongly built, with the rami broader. In- 

 ner ramus of 1st pair, as in the type species, composed of only 2 joints, and 

 about the length of the outer. Last pair of legs small, but with the distal joint 

 well defined, rounded quadrangular in form, and provided with 4 comparatively 

 short marginal setae, proximal joint with the digitiform process short and stout, 

 inner expansion only slightly produced and carrying 3 slender ciliated setae, 2 on 

 the tip and one inside. 



Colour whitish grey. 



Length of adult female 0.55 mm. 



Remarlfs. The above-described form is evidently referable to the genus 

 Zosime, as defined by Boeck, though differing from the type species conspicuously 

 both in its external appearance and in some of the structural details, especially 

 the mandibular palp and the last pair of legs. 



Occurrence. Only a solitary female specimen of this form has hitherto 

 come under my notice. It was found last summer in the Lyngdal Fjord, near 

 Farsund, in a depth of about 40 fathoms. 



Page 31. 



Ectinosoma neglectum, G. 0. Sars. 

 Distribution. Polar islands north of Grinnell Land (2nd Fram Expedition). 



Page 32. 



Ectinosoma prorjinqvum, Scott. 

 Distribution. Franz Josef Land (Scott). 



Page 34. 



Ectinosoma melaniceps, Boeck. 

 Distribution. Polar-islands north of Grinnell Land (2nd Fram Exp.). 



Pag. 35. 



Ectinosoma Normani, Scott. 

 Distribution. Franz Josef Land (Scott). 



Pag. 36. 



Ectinosoma curticorne, Boeck. 



Distribution. Franz Josef Land and Novaja Semlja (Scott); mouth of 

 Jan a river, Siberia (the present author). 



