76 Proceedings of the Royal Society of Victoria. 

 Family TRiARXHRADiE. 

 (xxxi) Polyartliva lilatypteva. Brighton, 

 (xxxii) Triarth^u longiseta. Brighton. 



Family Hydatinad.e. 



(xxxiii) Hydativa senta. Common. Plentiful on but 

 one occasion, when hundreds were dipped with a small 

 phial from a puddle not two feet in diameter in Hanna 

 Street, South Melbourne. These furnished an interesting 

 instance of rapid multiplication, as a half inch specimen tube 

 set aside with some of the water, and containing a dozen or 

 so of the rotifei-s, was seen after a few days to be almost as 

 closely packed with the rotifers, as it had previously been 

 with Euglena?, whicli had colom'ed the water a bright green, 

 and formed the food of H. senta. 



Family Notommatad^. 



(xx.:iv) Notomniatct aurita,. Botanical Gardens and 

 Oakleigh. 



(xxxv) iV. ansata. Botanical Gardens. 



(xxxvi) K. naias. [Brighton yielded a considerable 

 number of what is probably this species. They possessed 

 the two smaller eye specks on the front of the corona, figured 

 by Eckstein, and mentioned by Hudson and Gosse in a 

 foot-note (" The Rotifera," Vol. II, p. 25), but the "tentacular 

 brushes of setas " were not seen. A reference to Eckstein's 

 figure showed a general agreement between it and the 

 specimens found. — J. S.] 



(xxxvii) Copeus elvrenhergii. Botanical Gardens. 

 When first found, the specimens were entangled among 

 confervoid filaments, and for .some hours did not reveal the 

 " great lateral telegraph-like arms," which only appeared 

 when the animal was in open water, in a watch glass, or 

 deep cell. A good view was obtained of the vibratile tags, 

 which were large, and extended like a tan, the width acrcss 



