175 



joint comparatively short, not attaining the length of the 2 remaining joints com- 

 bined, last joint linear and longer than the preceding one. Natatory legs moder- 

 ately slender, and having the number of setae somewhat reduced, inner ramus in 

 the 2 anterior pairs considerably longer than the outer, with the last joint very 

 narrow, and only provided inside with a single seta, 1st and last joints of the 

 outer ramus in these pairs quite smooth inside. Last pair of legs comparatively 

 small, distal joint oblong in form, scarcely contracted at the base, and carrying 

 6 marginal setse, the 2 apical ones hair-like; inner expansion of proximal joint 

 short, triangular, with 4 set&e, the 2 innermost very strong, spiniform. Ovisacs 

 small, each with only 3 ova arranged in a single row. 



Male unknown. 



Colour whitish. 



Length of adult female 0.32 mm. 



Remarks. This form is still smaller than the preceding one, and indeed 

 one of the smallest Harpacticoida known. It is moreover easily recognized by 

 its very narrow body, comparatively short anterior antennas, and by the structure 

 of the legs. 



Occurrence. Only a solitary specimen, an ovigerous female, has hitherto 

 come under my notice. It was taken last summer at Farsund, south coast of 

 Norway, from a depth of about 30 fathoms, muddy sand. 



115. Amphiaseus productus, G. 0. Sars, n. sp. 



(PI. CXV). 



Specific Characters. Female. Body exceedingly slender and elongated, 

 linear in form, being everywhere of uniform width. Rostrum much produced, 

 narrow lanceolate. Urosome nearly as long as the anterior division, segments 

 apparently without the usual circlets of spinules. Caudal rami very much pro- 

 duced, being considerably longer than the anal segment and about 4 times as 

 long as they are broad, apical setse normal. Eye^wholly absent. Anterior an- 

 tennse rather elongated, 8-articulate, with the first 2 joints of unusual size and 

 combined exceeding half the length of the antenna, 3rd and 4th joints of about 

 equal size, terminal part scarcely exceeding in length l / s of the proximal part. 

 Posterior antennae without the usual seta on the anterior edge of the proximal 

 part, outer ramus rather elongated, with the middle joint very small and without 

 any seta. 1st pair of legs slender, outer ramus about the length, of the 1st joint 

 of the inner, middle joint with a well-developed seta inside, last joint somewhat 



