1889.] 



H. H. Anderson — Notes on Indian Bolifers. 



345 



XXL— Notes on Indian Botifers* — By H. H. Anderson, B. A. 

 [Received Sept. 10th ;— Kead December 4th, 1889.] 



(With Plates XIX— XXI.) 



For tlie last few months I have devoted what little time I conld 

 sjaare for work with the microscope to the study of Rotifers with the 

 twofold view of seeing what species already known to science I could 

 find in our Calcutta tanks and of discovering new forms. I commenced 

 on water and weed brought from the tanks on the further side of No. 2 

 Bridge, Entally, and I have found these so rich in specimens that I have 

 not yet turned elsewhere for my materials. I projiose to give in this 

 paper a list of the known species that I have been able to determine, 

 with notes as to frequency of occurrence, date on which observed, and 

 other details which may be of use to future observers. I have also de- 

 scribed some that I believe to be new forms, but I have confined myself 

 to those which are species of some known genus. I have drawings and 

 descriptions of others in my notebooks for which new genera will, I 

 think, have to be framed, but these I have reserved for further investi- 

 gation. I have followed throughout Hudson's and Gosse's classification 

 and nomenclature, and have based this paper on their book. As, how- 

 ever, their work includes descriptions of British Rotifers mainly, and only 

 the most important of non-British species, there is some imcertainty 

 whether some of the forms which I have imagined to bo new may not 

 be already known. I have studied Ehrenberg and Pritchard for con- 

 tinental forms, as well as such papers in scientific journals as I have 

 been able to get access to, so I trust I have not here described as dis- 

 coveries what have already been discovei-ed. This paper is, I hope, only 

 a first instalment, for our weedy tanks teem with Rotifera, and I have no 

 doubt tliat a few months more work would enable me to give a second 

 list as long as this one. 



Order 1. RHIZOTA. 



Family I. Flosculariadse. 



1. Floscularia oenata, Ehrenberg. 

 Common, in many tanks, at all seasons, size often much less. 



* Communicated by the Miorosoopioal Society of Caloatta, before which it was 

 read ou Sept. 9tb, 1889. 



