ft 



DIATOMACE& 



425 





FIG. 357 Diatomaceae : A, Eunotia monodon Ehrb. ; .Z?, Tricerattum Favus Ehrb. ; C, Surirelia 

 splendida Ktz. ; /), SynedraArcus Ktz. ; ^, Naviciila rhomboides Ehrb. ; ^', Pleurosigma lacustre 

 Sm. ; G, Cocco-nema lanceolatnm Ehrb. ; //, Meridian constrictnm Rlfs. ; /, Achnanthes breiripes 

 Ag. ; JiT, Diatvma elongatum Ag. (variously magnified). (After W. Smith.) 



