PART OF DIATOM CASE (PLEUROSIG.MA ANGULATUM) 



Magnified 4,900 diams. 



From a photo-micrograpJi by Dr. R. Zeiss 



Reproduced by periKission 0/ Messrs. C. Zeiss and Co. and Afessrs. J. and .i. 



Churchill, publishers of Carpenter s " The I^Iieroseo/>e" 



Faee /'V '5O 



