_ 



tiunetird. last -mall, daw-like and very mobile. Last pair of legs with the distal 

 joint of exactly tin- same appearance as in the female, proximal one. however, 

 much smaller ami not at all expanded. 



< ..lour pale yellow, sometimes with a faint rosy tinge. 



L'-ngth of adult female 0.56 mm., of male 0.-14 mm. 



/,' .mirk*. This form was hrietly described l>y Goodsir as early as the 

 yi-ar Is)."., and has subsequently been observed l>y several other autliors. The 

 Arctic form, '/,. Aurelii of Poppe, is very nearly related to this species, scarcely 

 dillering except in the form of the distal joint of the last pair of legs, which is 

 comparatively narrower and more produced at the tip. 



Occurrence. ] have met with this form not unfre<|iiently along the greater 

 part of the Norwegian coast, and I am disposed to helieve that the form recorded 

 hy Th. Scott from Kinmark as '/.. Auriln Poppe, may more properly he referable 

 to the present species. It is a strictly littoral form, living near the shore among 

 al^-e. ;md is occasionally left in tidal pools together with other littoral species. 

 The flattened form of its body makes it very easy for it to run along the fronds 

 of the alga' or other smooth objects. Male and female are often found tied to- 

 gether in copula, as figured by Clans. 



I >,-.!, i/,,itinn. British Isles (Goodsir), Heligoland (Glaus), coast of France 

 (<'anu). Arctic Ocean, at Xuvaja Xemlia and Fran/ Josef's Land (Scott). 



36. Zaus abbreviates, G. 0. Sars. n. sp. 



(I'l. XXXIIi. 



Body \ cry Hat, shield-like, rounded oval 

 in outline, with the segments of the anterior division lamellarly expanded later- 

 ally. Cephalic segment broadly rounded in front, rostrum broad, lamellar, obtusely 

 truncated at the tip. Last pedigerous segment very small. I'rosome comparative!} 

 short and broad, not nearly attaining half the length of the anterior division; 

 ir> nital segment considerably expanded and densely ciliated at the edges, postero- 

 lateral corners of tbis ;,nd tbe succeeding se-iueiit conicallv produced. Oaudal 

 rami about as in '/. >/////'//,/>. Anteriui 1 antenna' with the terminal part ver\ short. 

 -cMi-cely longer than the preceding joint. Posterior antenna' and oral parts re- 

 sembling in structure those parts in the preceding species. First pair of legs like- 

 wise rather sjinjhir, though \\ith the distal joint of the outer ramus comparatively 

 longer and lc^> dilated to\\;inls the end: inner ramus ai-med at the tip with 2 

 Bpines, one of which is digitiform and quite smooth. Natatory legs comparatively 



