dilated and carrying in front an extremely long and slender sensory filament, 

 terminal part short. 3-articulate, last joint projecting at the end in a hook-like 

 point. Posterior antenna', oral parts and natatory legs of essentially the same struc- 

 ture as in female: inner ramus of 2nd pair of legs, however, slightly transformed, 

 its terminal joint beini: oval in form and without any seta inside, but carrying 

 on the tip a curved, elaulike spine and inside it a single seta. Last pair of 

 legs \<T\ small, distal joint, as in female, not defined at the base, and provided 

 with 4 setae only, inner expansion of proximal joint very slight, and carrying 2 

 small diverging bristles. 



Length of adult male 0.45 mm. 



i;<'nirl,-s.- -The male of this form has not yet been observed, for which 

 reason the above short description of it has been given. On the annexed plate 

 a tigure of an adult female specimen is also given for comparison with the male. 



Ot'cin-i'i nee. I have of late years met with this form, not only in the 

 ( 'hristiania Fjord, but occasionally on the south coast of Norway, at Risor, Lillesand 

 and Farsund. In samples from the last-named locality, some few male specimens 

 were also found. Th. Scott records this form also from the Fin mark coast. 



/>i*trilnitin)t -Additional localities: Arctic Sea off Fran/ Josef Land and 

 Novaja Semlja (Scott). 



Page 28. 

 Add another species: 



Zosime incrassata, G. 0. Sars. n. sp. 



s.ippi. PI. :{. 



S/,n-i/ic Chni-iu-tn-x.Fcwalr. Body short and stout, with the anterior 

 division strongly inerassated and much broader than the posterior. Cephalic seg- 

 ment lame and deep, produced in front to a short rostral prominence, obtuse at 

 the tip. Kpimeral plates of the .'{ succeeding segments sub-imbricate, and each 

 terminating in an obtuse corner. Last pedigerous segment much narrower than 

 the preceding ones, and without any epimeral plates. I'rosome scarcely more 

 than half as long as the anterior division, genital segment imperfectly subdivided, 

 though exhibiting on each side m the middle a well-marked angular ledge. Caudal 

 rami comparatively short, being scarcely longer than they are broad, apical seta' 

 rather slender. K\e absent. Anterior antenna' short and thick. 7-articulate and 

 densely clothed \\jth bristles, some of whieh are spiniform. .'Jrd joint the largest, 

 the 4 out*' 1 ' .i"i" N \'!'y ^hort. Posterior antenna- resembling in structure those 

 in the type species. Mandilmlar palp very small, with the rami imperfectly de- 

 veloped, the inner one lamellitorm with onh 2 small diverging bristles, the outer 



