188 



in the preceding species, but comparatively broader and more pronouncedly 

 angular. Surface of shell rather uneven in its posterior part, each valve 

 exhibiting above a distinctly angular prominence, and below a likewise some- 

 what angular expansion, anterior edge densely fringed with hairs, lower part 

 of posterior edge more sparingly hairy and without any distinctly marked 

 teeth; sculpture as in the preceding species. Antennae comparatively shorter 

 and stouter, terminal joint of the anterior ones not nearly attaining half the 

 length of the penultimate one, flagellum of the posterior antennae much shorter 

 than in the preceding species. 



Male of rather small size, as compared with the female, with the shell 

 much narrower. Copulative appendages differing conspicuously from those of 

 the preceding species in the shape of the terminal part, the anterior extremity 

 of which is peculiarly bent in a hamiform manner. 



Colour of shell reddish brown. 



Length of adult female 0.69 mm. 



Remarks. The present species is nearly allied to the preceding one, but 

 of somewhat smaller size, and slightly differing in the shape of the shell. It 

 also differs in the want of any distinct teeth on the posterior edges of the valves. 



Occurrence. \ have taken this form in several places on the Norwegian 

 coast, from the Christiania Fjord to Finmark, in the laminarian zone, though 

 nowhere in any abundance. 



Distribution. British Isles, Baffin's Bay. 



Fossil. Scotland. 



90. Hemicyihere latimarginala, (Speyer). 



(PI. LXXXVI, fig. 3). 



Cythere latimarginata, Speyer, Die Ostracoden der Casseler Tertic-erbildungen, p. 22, 



PI. Ill, fig. 3 a-d. 



Syn: Cythereis abyssicola, G. O. Sars. 



Specific Characters. Female. Shell, seen laterally, oblong quadrangular 

 in shape, somewhat higher in front than behind, greatest height quite anteri- 

 orly and slightly exceeding half the length, dorsal margin projecting in the ocular 

 region to a very conspicuous gibbous prominence, behind which it appears 

 distinctly concaved, being only in its posterior part somewhat convex, ventral 

 margin rather deeply sinuated in the middle, anterior extremity unusually short, 

 being bluntly rounded off and considerably bowed below, posterior extremity 

 almost transversly truncated, with the lower comer but slightly produced and 

 evenly rounded off; seen dorsally, irregularly oval in outline, with the greatest 



