116 



summer becomes wholly dried up. The animals were seen swimming about 

 in the water rather quickly in the usual manner. 



Distribution. Sweden (Aim), British Isles (Brady), Germany (G. W. Miiller), 

 Russia (Fischer). 



41. Eucypris elliptica, Baird. 



(PI. LIII, fig. 2). 

 Cypris elliptica, Baird, Nat. Hist, of British Entomostraca, p. 158, PI. XIX, fig. 12. 



Specific Characters. Female. Shell rather tumid, seen laterally, oval 

 trigonal in outline, greatest height a little in front of the middle and slightly 

 exceeding 2 /3 of the length, dorsal margin gibbously arched and sloping with 

 an almost straight course to each extremity, ventral margin very slightly sinuated 

 in the middle and conspicuously bowed in the oral region, both extremities 

 evenly rounded off, the anterior somewhat broader than the posterior; seen 

 dorsally, oblong ovate in outline, greatest width behind the middle and slightly 

 exceeding half the length, anterior extremity more narrowed than the posterior. 

 Valves nearly equal, with the surface smooth and clothed with delicate hairs; 

 inner duplicatures very narrow. Structure of the several limbs not exhibiting 

 any noticeable peculiarity. Caudal rami of moderate length, slightly attenuated 

 and nearly straight, though a little curved downvards at the end, distal claw 

 about equal in length to 2 /s of the ramus. 



Colour light yellowish green. 



Length of adult female amounting to 1.50 mm. 



Male unknown. 



Remarks. \ think that G. W. Miiller was quite right in identifying the 

 form examined by him with Cypris elliptica Baird. At least the figures given 

 by Brady and Norman of this form seems to me to agree pretty well with 

 the present species, and I am by no means prepared to assent with Dr. Aim 

 in his opinion that these figures are more properly applicable to Eucypris 

 afjinis hirsuta of that' author, which belongs to the next genus, Cypricercus. 

 True, a certain resemblance between these 2 forms may be found in the shape of 

 the shell, as seen laterally; but the dorsal aspect is conspicuously different, 

 and the figure given by Brady and Norman in this aspect agrees perfectl 

 with that here reproduced. 



Occurrence.} have only once met with this species, viz., some years 

 ago in a small pond near Christiania. At first I indeed thought it to be a 

 large variety of Cypricercus offinis (see further on), to which it bears a per- 



the 



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