96 



Remarks. This genus was proposed as early as the year 1854 by Zenker, 

 but was taken by that author in a much wider sense than now generally 

 admitted. In the restriction at present adopted it is nearly allied to Cyclocy- 

 pris, but at once recognised from that genus by the much more compressed 

 shape of the shell, and also in the structural details some well marked diffe- 

 rences are found, as pointed out in the above given diagnosis. Several species 

 referable to this genus have been recorded from different parts of the world. 

 To the Norwegian Fauna belong 3 species, to be described in the sequel. 





30. Cypria exsculpta, (Fischer). 



(PI. XLIV) 

 Cypris exsculpta, Fischer, Beitrag zur Kenntniss der Ostracoden, p. 18, PI. XIX, figs. 3638. 



Syn : Cypris elegantula, Lilljeborg (not Fischer). 

 Cypria punctata var. striata, Zenker. 

 Cypris striolata, Brady. 



Specific Characters. Female. Shell, seen laterally, rounded trigonal in 

 shape, greatest height in the middle and equal to 2 /a of the length, dorsal 

 margin boldly arched throughout, ventral margin not at all sinuated, being 

 even somewhat convex in the middle, both extremities evenly rounded off; 

 seen dorsally, narrow oblong in outline, with the greatest width scarcely 

 exceeding 2 /6 of the lenght, side-edges almost straight, both extremities 

 obtusely pointed. Surface of valves very finely striated longitudinally and 

 clothed at each extremity with scattered delicate hairs. Caudal rami compara- 

 tively narrow and almost straight, with the dorsal edge smooth, apical claws 

 rather slender, the distal one somewhat exceeding half the length of the ramus. 



Male of somewhat smaller size than female and having the posterior part 

 of the shell comparatively more expanded. Right prehensile palp of max- 

 illipeds with the propodos conspicuously dilated at the end, forming inside a 

 thumb-like acuminate projection, to the side of which a thin spiniform appen- 

 dage is attached, dactylus very strong and evenly curved, with a dentiform 

 prominence in the middle of the concave edge; left palp less strongly built, 

 with the propodos not at all dilated at the end, and the dactylus much smaller. 

 Copulative appendages with the terminal lappets not much produced, the upper 

 one narrower than the lower. 



Colour light olivaceous brown. 



Lenght of adult female amounting to 0.85 mm. 



Remarks. This form, first described by Fisher under the above name, 

 may be easily distinguished from the other 2 species here recorded by its 



