300 



INDEX. 



Westianum, Cosmarium, III 135 



Xanthidium, IV 81 

 Westii, Staurastrum, V 187 

 Willeanum, Cosmarium, III 148 

 Willei, Dysphinctiuni, III 148 

 Wittrockii, Cosmarium, III 179 



var. Schmidlei, III 179 



Ursinella, III 179 



Wrightianum, Cosmarium, III 127 

 Xanthidium, I 4, 27 ; IV 48 



zonatum. Cosmarium, III 123 



Dysphinctium, III 123 

 Zoos pores, I 9 

 Zygospores, I 10, 11 



ADLARD AND SON AND WEST NEWMAN, LTD., LONDON AND DORKING. 



