On Auslrulian Entomostracans. 59 



are not uncommon, the generative system being nearly 

 the same in both. I shall describe that of the former, 

 although it was first discovered in the latter. The male 

 organs consist of two testes, placed parallel to each other 

 within the abdomen, and connected by a duct, each with its 

 respective penis, PI. IX., A. 10, 0. 3. Each testis consists 

 of a long narrow muscular cyhndrical vessel, surrounded by 

 hairs arranged in pyramidal tufts, the whole being enclosed 

 within a membranous covering, so as to form an oblong 

 capsule. 



When the membrane is broken the testis assumes a curved 

 shape, proving a considerable degree of muscular tension 

 in its original condition. The penis, which is double and 

 placed on the abdomen, is a pyriform organ, carrying at 

 its extremity two short joints turning towards each other, 

 and forming a clasping apparatus. 



The female parts are simple, PL IX., C. 4., being com- 

 posed of two long pyriform (?) ovaries, each consisting of 

 an envelope of tubular hairs enclosed within the abdomen. 



The only points of diflference peculiar to New?ihamia are, 

 the testes are shorter and stouter, while the penes are altogether 

 smaller. This, however, is counterbalanced by the shape 

 assumed by the abdominal feet of the male, PI. IX., A. 11-12, 

 which are evidently calculated for clasping. 



In Newnhamia coition takes place while the animals are 

 swimming at the surface ; during the operation they sink 

 towards the bottom. In Cypris carinata, on the contrary, 

 the same operation is performed at the bottom or on the 

 stem of a plant. 



Habits. — The Cypridse are certainly carnivorous. They 

 are, in fact, the scavengers of the ponds in which they live. 

 In the small basin in which I have kept several species for 



