161 



ON THREE NEW SPECIES OF ROTIFERA. 



By Charles F. Rousselet, F.R.M.S. 



{Read January 2Wi, 1911.) 



Plate 7. 



From time to time collections of Kotifera from various parts 

 of the world are sent to me for examination, and occasionally 

 these contain very interesting new forms which have not pre- 

 viously been recorded. The three species here described were 

 obtained in this way. 



1. Anuraeopsis navicula sp. nov. (PL 7, Fig. 1). 



In 1904-5 Prof. A. Borgert visited Ceylon and brought back 

 samples of plankton collected in Lake Gregory, situated in the 

 Central Province of Ceylon, at an altitude of about 6,000 feet. 



This plankton material, as well as the physical conditions of 

 this lake, have already been reported upon by Prof. C. Apstein, 

 of Kiel,* who has been good enough to send me a small sample 

 of the tow-netting in order to determine this small Rotifer, 

 which I found to be undoubtedly new, and to which I have 

 given the above name. 



The generic name of Anuraeopsis was proposed by Prof. 

 R. Lauterborn in 1900 to receive Gosse's well-known species 

 A. hypelasma, which is altogether different from all the other 

 species of Anuraea by being devoid of all spines and by other 

 characters. 



The present new species also has no spines, and appears to 

 belong to this genus, although the details of its anatomy are 

 as yet unknown. Like A. hypelasma, it is very small in size, 

 and has a very thin and delicate lorica of light-brown colour. 



* C, Apstein, " Das Plancton des Gregory-Sees auf Ceylon,'' Zoal. Jahrb., 

 1910, Bd. 29, pp. 661-80. 



