308 



Notes on Rotifers. 



By G. Western, F.R.M.S. 



{Read September Ibth, 1893.) 



Callidina sordida=Callidina longirostris, Janson. — This Rotifer 

 is one of those I brought to your notice as new species in October 

 last year, and you will find my description and figure in the 

 July number of our Club Journal. T have since seen a paper 

 on the Philodinadae by Dr. Otto Janson, of Marburg Univer- 

 sity, in which he also describes it under the name of Callidina 

 lo7i(jirostris. As it would only cause confusion to retain the two 

 names for the same animal, I propose to cancel that I gave it, 

 and in future to recognize it as Callidina longirostris. 



Battulus hicornis. — On the same occasion I described a small 

 Rattulus under this name. I regret to say that an error has 

 crept into the description which, if uncorrected, would 

 materially interfere with its future identification. The toes 

 are equal in length, and not unequal as stated. Mr. Rousselet 

 has also brought to my notice that on separating the toes by 

 the use of a compressor, a third substyle, about two-thirds the 

 length of the toes, becomes visible. The description should 

 therefore be — " Toes equal, substyles three." Mr. Rousselet 

 has also made a very accurate figure of the trophi of this 

 Rotifer, which, at my request, he will publish in the forthcoming 

 number of the Journal. I may mention that in Wierzej ski's 

 work on the " Rotifera of Gralicia " there is a description and 

 figure of a new species of Cselopus, C. similis. The figure has 

 such a close resemblance to this Rotifer of mine that I think it 

 more than probable a doubt may arise as to whether they are 

 not really identical. I therefore state that the one I describe is 

 certainly a Rattulus, as I shall be pleased to demonstrate to 

 any particularly interested by exhibition of specimens. 



