Fresh-Water Entomostraca from China and Sumatra. 7 



maturity. In order to show the identity, I give on the ac- 

 companying plate an habitus-figvu'e (side-view) of one of 

 the specimens drawn from Hfe, and a figure of the caudal 

 piece of the same specimen more highly magnified. It will 

 be seen from the figure, that the lines of growth are very 

 numerous, amounting to about 12 in each valve, indeed 

 the greatest number I have ever met with in Norwegian 

 specimens. Notwithstanding this, the size of the animal is 

 rather inferior to that of the largest Norwegian specimens, 

 the shell measuring in length only 8 "60 ™"^ by a height of 

 580 ™™ ; but this may easily be accounted for by the fact, 

 that the individual was reared in a comparatively small 

 aquarium. 



In my opinion, the Japonic form described by Prof. 

 Ishikawa as L. niponica is likewise identical with the Euro- 

 pean species. The specimens examined by that author were 

 all evidently quite young, having no egg-paquets and only 

 2 or 3 lines of growth on each valve, and, to judge from 

 the figure given, they perfectly agreed in the shape of the 

 shell with equal-sized specimens of L. lenticularis (see my 

 account of this species in «Fauna Norvegiæ», Vol. I). 



CLABOCCRA. 



FAM. SIDIDÆ^. 



1. Diaplianosoma Sarsi, Richard. 

 Occurrence. — Some few specimens of this form, first 

 described by Dr. Richard from the lake Toba in Sumatra, 



