DIATOMACE.-E 



425 



Fig, 357— Diatomaceae : A, Ennotia monodon'Ehrh. ; B, Triceratinvi FavnsY\v[\>.\ C, Surirclla 

 spiendida Ktz. ; D, Synedra Arciis Ktz. ; E, Xa-nczila rhoviboides Ehrb. ; /", Pkurosigma lacustre 

 Sm. ; 6^, Coccone»ia ianceolatian Ehrb. ; //, M cridion constrictttni Rlfs. : 7, Achnanthes trei'ipes 

 Ag. ; K, Diatuina elongatiivi Ag. (vaiiously magnified). (After W. Smiih.) 



