Fresh-Water Entomostraca from China and Sumatra. 37 



Occurrence.^ — This form developed very abundantly 

 in the greater number of my aquaria prepared with mud 

 from Sumatra. All the specimens w^ere of the female sex 

 and exhibited across the back the characteristic dark trans- 

 versal band, from which the specific name has been derived. 



D i s t r i b u t i o n. — Europe. 



16. Dolerocypris sinensis, G. O. Sars, n. sp. 



(PI. IV, figs. 7, 7 a— b). 



Specific Characters. — Female. Shell, seen laterally, 

 narrow oblong in form, greatest height scarcely exceeding 

 ^ of the length and occurring somewhat behind the middle, 

 dorsal margin but slightly arched, nearly straight in the 

 middle, ventral evenly concaved, anterior extremity obliquely 

 rounded, posterior not much attenuated and obtuse at the 

 tip; — seen dorsally, narrow fusiform in outline, greatest 

 width about equalling l of the length, both extremities acu- 

 minate. Valves slightly unequal, the right one overlapping 

 the left somewhat both in front and behind ; inner duplica- 

 tures comparatively narrower than in D. fasciata; surface 

 smooth, with scattered hairs at each extremity. Caudal rami 

 rather strong, almost straight, and slightly attenuated dis- 

 tally, apical claws coarsely dentate, the outer one almost 

 twice the length of the inner, and equalling half the length 

 of the ramus, seta of dorsal edge verj^ small, and occurring 

 close to the base of the inner claw, apical seta about half 

 the length of the outer claw. 



Colour. — Shell of an uniform light greenish colour, 

 without any distinct dark band across the back. 



Length of shell 1-93 "i"^, height 066 ■'"", width 0-50 '™^\ 



20 — Archiv for Math, og Naturv. B. XXV. 

 Trykt 2. .luh 1903. 



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