354 



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 hack-like 

 point. Posterior antennae, 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 being oval in form and without any seta inside, but carrying 

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

 legs very 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. 



Remarks. 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 figure of an adult female specimen is also given for comparison with the male. 



Occurrence. I have of late years met with this form, not only in the 

 Christiania 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 Finmark coast. 



Distribution. Additional localities: Arctic Sea off Franz Josef Land and 

 Novaja Semlja (Scott). 



Page 28. 

 Add another species: 



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



(Suppl. PI. 3). 



Specific Characters. Female. Body short and stout, with the anterior 

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

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

 the tip. Epimeral plates of the 3 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. Urosome scarcely more 

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

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

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

 rather slender. Eye absent. Anterior antennae short and thick, 7-articulate and 

 densely clothed with bristles, some of which are spiniform, 3rd joint the largest, 

 the 4 outer joints very short. Posterior antennae resembling in structure those 

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

 veloped, the inner one lamelliform with only 2 small diverging bristles, the outer 



