DIATOMACE^ 



425 



Fig. 357 — Diatomacese : A, Ennoiia vionodon Ehrb. ; B, Triceratiutn Favits Ehrb. ; C, Surirell - 

 s^lendidaVtXz. ; D^SynedraArcus Ktz. \E^ Navicularhomboides Ehrb. ; h\ Pleurosigtna iacustre 

 Sm. ; G, Cocconemalanceolatunt Ehrb. ; //, Meridionconstrictwt Rlfs. ; /, Achnanthes brevipes 

 Ag. ; /f, Di&tuma elo7igatum Ag. (vaiiously magnified). (After W. Smiih.) 



