Smithsonian Report, 1936. Conger 



Plate 14 



Types of diatom shape and structure continued. 



Upper left, Biddulphia major Grove. X 300. Center right. Biddulphia archangelskiana (Witt) 

 Upper right, Biddulphia crenulata (Gr. and St.) Mann. X 480. 



Mann. X 500. Lower left, Biddulphia horrida {Pant.) Mann. X «0. 



Center left, Biddulphia glavdifera (Grun.) Mann. Lower right, Biddulphia cellulosum (Grev.) Mann 

 X 410. var. Sijnbirskiana O. M. X 480. 



