Fresh-Water Entomostraca from China and Sumatra. 27 



uous. Caudal rami of a similar structure to that in the 

 preceding species, though a little larger. 



Colour. — Shell semipellucid, with a yellowish tinge, 

 and without any true pigmentary patches, though exhibiting 

 in the middle a dark shadow caused by the translucent 

 anterior dilatation of the intestine ; coecal appendages like- 

 wise very conspicuous and dark-coloured. 



Length of the shell I'OS ™™, height OoS™™, widt 0-50"^"^. 



Remarks. — This species is at once distinguished from 

 the preceding one by the rather different shape of the shell. 

 It is, however, evidently congeneric with it, exhibiting the 

 same characteristic structure of the valves and of the several 

 appendages. 



Occurrence. — This form also developed rather abund- 

 antly in some of my aquaria prepared with mud from Su- 

 matra, and was likewise found not unfrequently in the 

 sample taken by Mr. Iversen. As with the preceding species, 

 only female specimens occurred. 



6. Hemicyprls megalops, G. O. Sars, n. sp. 



(PI. Ill, figs. 3, 3 a— b). 

 Specific Characters. — Female. Shell comparatively 

 shorter and higher than in H. ouata, seen laterally, regularlj^ 

 oval in form, greatest height about equalling f of the length 

 and occurring in the middle, dorsal margin evenly arched, 

 ventral nearly straight, anterior extremity obliquely rounded, 

 posterior somewhat broader and obtusel}^ truncated ; — seen 

 dorsally, ovate in form, greatest width exceeding half the 

 length, anterior extremity more attenuated than posterior. 

 Valves less unequal than in the 2 preceding species, right 



