87 



thin and pellucid and sparingly hairy at each extremity, surface quite smooth 

 and polished, inner duplicatures less broad than in the preceding species. 

 Anterior antennae with the terminal part fully as long as the basal one, and 

 having the last 2 joints rather elongated and subequal in size, setae comparati- 

 vely shorter than in the preceding species. Posterior legs with the penulti- 

 mate joint distinctly subdivided, shortest of the apical setae not hamiform. 

 Caudal rami somewhat less strong than in the type species and slightly cur- 

 ved, apical claws rather thin, the distal one exceeding somewhat half the length 

 of the ramus. 



Colour transparent whitish. 



Length of adult female amounting to 0.95 mm. 



Remarks. Though the outline-figures of the shell given by Dr. Aim. do 

 not fully agree with those here drawn, I cannot doubt that the above-described 

 form is identical with Aim's species, as otherwise no difference could be detec- 

 ted. The species is readily distinguishable from C. Vavrai by the very nar- 

 row and elongated shell, the shape of which, as seen laterally, exhibits a per- 

 plexing resemblance to that in Catidona anceps, Ekman. 



Occurrence. Some few specimens of this pretty species were found in the 

 same localities in which C. Vavrai occurred. I have moreover taken it occasio- 

 nally in the Maridal lake near Christiania and in the Van lake near Moss at 

 depths varying from 2 to 20 fathoms. 



Distribution. Sweden (Aim). 



Gen. 11. Candonopsis, Vavra, 1891. 



Generic Characters. Shell thin, compressed, more or less reniform in 

 shape, with the inner duplicatures of the valves very broad in front. Both 

 pair of antennae, and particularly the anterior ones, very slender, but not adap- 

 ted for swimming, the posterior ones in male with the penultimate joint subdi- 

 vided, as in Candona. Mandibular palp unusually produced, with the terminal 

 joint long and narrow. Maxillipeds with a well defined vibratory plate carrying 

 3 thickish plumose setae, palp in female slender and attenuated, in male trans- 

 formed in a similar manner to that in Candona. Posterior legs resembling in 

 structure those in Cryptocandona, except that the seta inside the end of the 

 penultimate joint is wanting. Caudal rami very slender and narrow, without 

 any trace of a dorsal seta. 



Remarks. This genus was established in the year 1891 by Vavra, to in- 

 clude the form recorded by Brady and Robertson under the name of Candona 



