(>7<» Transactions of the Society. 



vars. fimhriata and bitorquata, and Callidina even"/" var. nodosa) 

 are only known to exist in tropical and subtropical countries. 



C. pinniyer and Rotifer lonyirostris var. Htorqiiata are tin- 

 only forms in our list at present only known in Central Africa. 

 Varieties approaching Callidina pinniyer are known in India, 

 South Africa, etc. 



In the isolated island of Madagascar only known species were 

 observed. 



An examination of various tropical and subtropical regions 

 (India, Africa, South America) indicates a considerable Bdelloid 

 fauna restricted to hot climates. The polar regions have not ex- 

 hibited any such peculiarity, such species as have been found there 

 being common natives of the temperate zone. 



There is no bar to the distribution of Bdelloids over the whole 

 globe, except such as is imposed by climate. Where similar con- 

 ditions prevail, the same species may be expected. 



Bibliography. 



1. Bryce, D. — Further Notes on Macrotrachelous CalUdinse. Journ. Quekett 



Micr. Club, ser. % v. (1894) p. 436. 



2. Janson, C. — Die Rotatorien-Familie <ler Philodinaeen. Marburg, 1893. 



3. Murray, J. — A New Family and Twelve New Species, etc. Trans. Roy. 



Soc. Edinburgh, xli. (1905). 



4. „ Rotifera of the Scottish Lochs. Op. cit., xlv. (1906). 



5. „ Some Rotifera of the Sikkim Himalaya. Journ. Rov Micr. 



Soc, 1906, p, 637. 



6. „ Some South American Rotifers. Amer. Nat., Feb. 1907, p. 97. 



7. Thompson, P. G. — Moss-haxmting Rotifers. Science Gossip, 1892, p. 56. 



8. Weber, E. F. — Faune Rotatorienne du Basin du Leman. Rev. Suisse de 



Zool., v. (1898) p. 347. 



