'Z THE GENUS TBACHELOMONAS, 



reticulata', Lemmermann, " Reise nach der Pacific " (Abh. Nat. 

 Ver. Bremen, Bd. xvi., 1899), Tr. oblonga, n.sp.; Lemmermann, 

 " von Dr. Volz gesammelten Siisswasseralgen " (ibid., Bd. xviii., 

 1904), 2V. Volzii, n.sp., with observations on Tr. volvocina, Tr. 

 ohlonya, Tr. euchlora{Tr.layenella), Tr.hispida, Tr. a7^mata, a.nd 

 Tr. bulla, figures and descriptions of new forms; Bruno Schroder, 

 "Alg. der Versuch. zu Trachenberg"(Ploner Berichte Th.v.,1897), 

 figures of two variations of 7V. hispida; Maskell, "On Freshwater 

 Infusoria " (Trans. New Zealand Inst., 1886), figure and descrip- 

 tion of Tr. crenatocollis, n.sp.; ibid., 1887, Tr. teres, n.sp. 



As I have not access to either Ehrenberg, " Die Infusoriens- 

 thiere," 1838; Perty, "Kleinster Lebensformen in der Schweiz," 

 1852; or Schmarda, "Neue Formen von Infusorien," 1850, 1 have 

 been obliged to accept Stein's excellent figures as typical of the 

 seven species described in these memoirs. Tr. armata, however, 

 is excepted, in whose case, Ehrenberg's original description is 

 quoted by Lemmermann, I.e., Bd. xviii , p. 165. I know of no 

 publications, other than the above, containing new forms of 

 Trachelomonas. 



These memoirs give a total of 25 published species of greater 

 or less validity, and 8 variations, the majority of which are dis- 

 cussed in this paper, in addition to a large number of types and 

 variations apparently never before noted. In many cases, un- 

 fortunately, the exact European type has not been observed by 

 me, but only a very similar form, showing, however^ the specific 

 characteristics sufficiently well for identification. It is, indeed, 

 through these " very similar forms " that what is truly charac- 

 teristic and what is not, become most clearly discernible. 



The present paper deals with forms of 2\achelomonas found in 

 New South Wales during the past seven years, and even then 

 only in the two districts of Sydney and Lismore. Whatever 

 may be the case in Europe, our waters here are very rich in 

 forms of the genus, exhibiting a great variety of types. Ground- 

 gatherings are best, out of swampy places, and especially out of 

 shallow rainwater pools on grass-lands, the favourite haunt of 

 green flagellates of all descriptions. Gatherings out of weeds are 

 not, as a rule, so good. 



