454 



INDEX. 



PAGE 



Triceratium, Photomicro- 

 graphs of . . . 201 

 Trichia affinis . . . 337 

 Trichodragmata as mutations 39 

 Trough for pond-life . . 85 



valida, Hahrotrocha . .160 



verecunda, Macrotrachela . 149 



Voigt (Dr.), Method of 



collecting . . .211 

 Volvox, Two African species 



of. G. S. West . . 425 



Volvox africanus . .426 



— Rousseletii . . . 426 



W 



Watch-glasses, solid . .323 



Water-mites, s.v. Hydracarina. 



Wenham binocular, adapter 

 for use with 



West, G. S. A further con- 

 tribution to our know- 

 ledge of the two African 

 species of Volvox 



Williamson, W., and Soar, 

 C. D. Lebertia sefvei . 



Wilsoni, Eylais 



X 



X-ray research into organic 

 structure. J. E. Barnard 



Y 



Yermoloff,N. Notes on some 

 intermediate forms of 

 the genera Navicula and 



PAGB 



396 



425 



375 

 281 



195 



Cymbella 



407 



