36 G. O. Sars. 



Colour. — Shell rather pellucid, of an uniform pale 

 3'ellowisli hue, without any pigmentary patches. 



Length of shell 046 i""\ height 028 "^"\ width 026 "^"^. 



Remarks.^ — In the shape of the shell and its absolute 

 want of any pigmentary patches, this form conspicuously 

 differs from the other known species of the genus, and, 

 indeed, at first I was more inclined to refer it to the genus 

 Cyclocypris. On a closer examination, however, the caudal 

 rami were found to exhibit the rudimentary structure char- 

 acteristic of the genera Cypridopsis and Cypridopsella. It still 

 remains somewhat doubtful, to which of these 2 genera it 

 should properly be referred. 



Occurrence.^ — Only some few female specimens of this 

 dwarfed form have come to my notice. They were found 

 in one of my aquaria prepared with mud from Sumatra. 



15. Dolerocypris fasciata (Müller). 



(Pl. IV, figs. 6, 6 a). 

 Remarks. — I fully agree with Dr. Kaufmann, that 

 this characteristic form, which I formerly referred to the 

 genus Stenocypris, ought more properly to be considered as 

 the type of a separate genus. The correctness of such a 

 view becomes now still more evident by the discovery of 

 another nearly-allied species, to be described in the sequel. 

 For comparison with this species, and to show the identity 

 of the Sumatrense form with the European species, I give 

 on the accompanying plate an habitus-figure (lateral view) 

 of one of the specimens reared in my aquaria, together with 

 a more highly magnified figure of one of the caudal rami. 



