Surface of shell without any 

 exhibiting on either .side, neai 



' greyish with ;« greenish shad,' dorsally, in male more or 

 i dotted with purplish brown. Natatory seta- of the upper 

 enure very long- and slender, those of the lower antenna con- 

 'rably exceeding the terminal claws. Caudal rami slightly 

 ved, < laws very slender, almost setiform, seta of dorsal edge 

 tched somewhat below the middle. Length of adult female 

 ) mm., of male 0,84 mm. 



HemarJcs, — This species is very nearly related to the nor- 

 i-n form. /. gibha (Ramdohr), though easily distinguished by 



absolute want of the peculiar lateral protuberances, charae- 

 *ing that species. In some specimens of the northern form 

 se protuberances are certainly very small, but I have never 

 nd them completely wanting as in the Australian species. 

 ! 2nd northern species, which I believe to be identical with 

 »->s hi/Jnn/a Koch, is very distinct from both these species 

 the natatory S et;e of both pairs of an teniae quite short, 

 ' lln ' animal, unlike what is the case with the other spe- 



DescripHon. - The length of the shell in adult female spe- 

 ens does not exceed 0,90 mm; that of the male is still smal- 

 the length being only 0,84 mm. 



Seen laterally (PI. n, fig. 5) the shell of the adult female 

 1 " ls a somewhat oblong quadrangular, or rather angular sub- 

 1 """ s ''iipe The greatest height, unlike what is generally 

 ^inCyprididaB, lies in the anterior part, about where the 



has ita P la ce, and considerably exceeds the half length. The 

 01 '' xl ''<'iiiity is broadly rounded, whereas the posterior is 



almost angular bend 



