176 KOTATORIA 



list is further rt'clucctl l>y tlie union of Proalcs gibba Ehrenh. and Jh'aschica sciiiiapcrta Gosse 

 under the name of Cephalodella aHriculata (Miiller) (Harring and Myers, 1924). The 

 following;" list, tlierefore, gives all the valid species recorflcd 1)y Stewart: 



J'liiludiiia crytlioplilhalnia l'",lirenl). 



1'. roseola Ehrenh. 



P. citrina Ehrenl). 



Notoimiiata aiirifa (JMuller ) 

 *A'^. copeus Ehrenh. 



Cephalodella auricidala (Miiller) 

 *C. catcllina (Miiller) 



C. exigna (Gosse) 



Scaridiuin longicaiiditin ( IMiiiler) 

 *'rricJwcerca longiscta (Schrank) 

 *Trichotria pocilluin (Miiller) 

 *Mytilina z'entralis brei'ispina (Ehrenherg) 

 *Euchlaiiis dilatata l^hrenherg 

 ^Xotholca striata (Miiller) 



An asterisk indicates that the species in question was obtained also from our collections 

 from W'estern Tibet. 



.\ndersou's and Murray's lists alone refer to territory which is within the boundaries of 

 the Indian Empire. Taken together sixty-seven species are recorded by these two authors, of 

 these, sixteen were found in our collections. In the latter, therefore, eighty-three species are 

 fnund, nut hitherto recurded fr(im India, and the total Indian list is brnught up tu une hundred 

 and fifty. When it is remembered that Ahlstrom (1933 J has recorxled one hundred 

 and nineteen species from a single embayment of Lake Isrie, it becomes clear that the 

 Rotatoria t)f India are still extremely little known and ctTer a prumising field for furtiier 

 investigation. 



VI. THE ROTATORIA^ FAUNA OF HIGH AFTITUDES 



The only previous collection of Rotatoria from the higher parts of the Himalaya is that 

 described by Stewart, whose recognisable species are enumerated above. No other collection 

 from over 4000 m. appears to have been hitherto reported. Smirnov (1930) has enumerated 

 14 species and 2 varieties frnni the Pamirs but his collection was made apparently between 

 3700 and 3900 m. 



In our material 42 determinable species are recorded from 18 separate localities in 

 Indian Til)et between 3500 and 5334 m., while from 12 localities in Kashmir, lying between 

 1580 and 2667 m. we record 58 species. It would aiijiear, therefore, that a slight decrease 

 in number of species occurs in ])assing from the lower to the higher localities. Further 

 analysis brings this out much more clearly. Of the 42 species recorded from Indian Tibet 

 33 were fountl in 9 localities (of which 3 were alkaline) below 4500 m. and 22 species were 



