20 G. O. Sars. 



6. Cyclops afflnis, G. O. Savs. 



Occurrence. — Several specimens of this form devel- 

 oped in the aquaria prepared with mud from China. This 

 is the first instance of a Cyclops being raised from dried 

 material. 



Distributio n. — Europe, Australia. 



OSTRACODA. 



FAM. CYPRIDIDÆi. 



1. Cypris purpurascens, Baird. 



(Pl. II, figs. 2, 2 a— d). 



Cypris purpurascens, Baird, 'Description of some new 

 recent Entomostraca from Nagpur'. Proceed. Zool. Soc. Lon- 

 don 1859. 



Specific Characters. — Female. Shell moderately 

 tumid, seen laterally, oblong oval in form, greatest height 

 scarcely attaining half the length and occurring a little in 

 front of the middle, dorsal margin somewhat angularly 

 curved, ventral with a very slight sinus in front of the 

 middle, anterior extremity broader than posterior, both evenly 

 rounded at the tip ; — seen dorsally, oblong fusiform in out- 

 line, greatest width about in the middle and equalling half 

 the length, both extremities obtusely acuminate. Valves 

 somew^hat unequal, the left one overlapping the right along 

 the anterior extremity by a hyaline rim, surface smooth, 

 with scattered delicate hairs at each extremit3^ Immature 

 specimens having, as usual, the anterior part of the shell 

 considerably higher than the posterior, and moreover dis- 



