89 



rather large and triangularly produced. Ejaculatory tubes very large and 

 distinctly observable through the pellucid shell. 



Colour transparent whitish. 



Length of female 0.95 mm., of male about 1 mm. 



Remarks. This form was first recorded in the year 1870 by Brady and 

 Robertson as a species of Candona, and description and figures of it were also 

 given in the more recent Monograph published by the first-named author in 

 connection with Norman; but its true relation to Candona was first made out 

 in the yar 1891 by Vavra. I had myself long ago been aware of this beautiful 

 Ostracod, but had erroneously identified it with Candona fabceformis (Fisher), 

 a species not yet found within the limits of Norway. 



Occurrence. I have taken this form rather abundantly in some muddy 

 creeks at the border of the 0stensj0 lake near Christiania, and more recently 

 also at Grimstad, south coast of Norway. Male specimens seem to be fully 

 as frequent as females and are readily recognised by the translucent large ejacula- 

 tory tubes. 



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

 Bohemia (Vavra), Switzerland (Kaufmann), Siberia (G. O. Sars). 



Group 3. Cyclocyprides. 



Remarks. This group as yet comprises 3 genera, viz., Cyclocypris, Cypria, 

 and Physocypria, the validity of the last-named genus being however some- 

 what questionable. Owing to a certain resemblance found in the structure of 

 the ejaculatory tubes and in the subdivision of the penultimate joint of 

 the posterior antennae in the male, G. W. Muller has combined this and the 2 

 preceding groups, to form a particular subfamily of the Cypridae, Candonince, 

 and Dr. Aim has recently adopted the same view, though proposing to change 

 the name of this subfamily to Candocy prince. I think however that the arrange- 

 ment here proposed might be found to be more appropriate, and in particular 

 I must insist on the necessity of keeping the present group sharply apart from 

 the Candonides, with which it scarcely exhibits any closer affinity, except in 

 the 2 above-named characters. In habits, too, the forms comprised within the 

 present group widely diverge from the Candonides, being, quite in contrast 

 to the latter, exceedingly agile animals, more perfectly indeed equiped for 

 swimming than most other Cypridae. 



11 Crustasea. 



