Jourx. O.M.C. 



. . _. 



# 



- - . * - 



I 



Sen 2, Vol. XII., PI. 23. 



\ \ v 



i O 



V 



V 



5>~ 



m 



|&x 



8 



t*it 



... 4 h. 



RapKe 



i r 



V 



17 











II 



-v. -o 



74 



/ 



> 



15 



Rapht 



12 



. . ; 

 ,./ 

 .... 



. t . 



16 



SCALE 



IOC 



C OF CN INCH X 1500. 



SCALE 



1000 OF AN INCH X 3000. 



N E. Brown, del. ad nat. 



Structure of Diatoms. 



