22 



Length of adult female amounting to 0.70 mm. 



Remarks. The present species is closely allied to the typical one, but 

 of considerably larger size and somewhat more slender form of body, differing 

 moreover conspicuously in the more produced caudal rami and in the structure 

 of the last pair of legs. It is very probable, that the form recorded by British 

 authors as Z. typica Boeck is more properly referable to the present species. 



Occurrence. I have met with this form occasionally in 2 different 

 localities on the southern coast of Norway, viz., at Korshavn and Ris0r. It 

 occurred in both places together with the typical species in depths ranging 

 from 20 to 50 fathoms, muddy bottom. Only female specimens have as yet 

 come under my notice. 



Distribution.? British Isles (Brady & Scott). 



13. Zosime valida, G. O. Sars, n. sp. 

 (PI. XIV). 



Specific Caracters. Female. Body of a more robust and compact 

 form than in the preceding species, with the 2 chief divisions less sharply 

 marked of from each other and nearly of equal length. Rostral plate rather 

 prominent and sub-triangular in form, tip narrowly truncated and carrying the 

 2 usual sensory hairs. Lateral lobes of the anterior caudal segments far less 

 prominent than in the preceding species; penultimate segment, as in that 

 species, armed along the hind edge dorsally with a row of denticles, which 

 however are much stronger and of a somewhat flattened form. Caudal rami 

 comparatively broad, sub-lamellar, the greatest width considerably exceeding 

 half the length; seta of outer edge remarkably strong and attached to a sharply 

 defined ledge somewhat remote from the end; apical setae present in the usual 

 number, that of the outer corner longer than that of the inner; the 2 middle 

 setae well developed and of quite normal appearance. Anterior antennas 

 apparently composed of 7 joints densely clothed with setae, most of which are 

 coarsely ciliated. Posterior antennae, oral parts, and natatory legs exhibiting 

 the structure characteristic of the genus. Last pair of legs with the distal joint 

 wholly confluent with the proximal one; inner expansion of the latter com- 

 paratively small, and only provided with 2 slender setaa, both issuing form the 

 narrowly truncated tip. 



Colour whitish grey. 



Length of the specimen examined 0.70 mm. 



