PSETJDOPODIA OF DIATOMS. 623 



EXPLANATION OF PLATE XLI, 



Illustrating Mr. J. G. Grenfell's note " On the Occurrence of 

 Pseudopodia in the Diatomaceous Genera, Melosira and 

 Cyclotella." 



Fig. 1. — Melosira of the first gathering in the Botanical Gardens, much 

 branched. The second frustule shrivelled in drying. Stained. 



Fig. 2. — Melosira of the same gathering. Stained. 



Fig. 3. — Melosira filament from Botanical Gardens. Stained. 



Fig. 4. — From Heytesbury, in Wiltshire. Unstained. 



Fig. 5. — Cyclotella from Botanical Gardens. Four thick granular pseudo- 

 podia. Unstained. 



Fig. 6. — Cyclotella Kiitzingiana from Botanical Gardens. Unstained. 



Fig. 7. — Ditto, with more pseudopodia. 



Fig. 8. — Two forms from Botanical Gardens, roasted at low red heat, 

 showing projections and connecting band. 



