FIG. 161. DIATOM OOZE. (AFTER CHUN, FROM "KRUMMEL'S 

 OCEANOGRAPHIE," BY PERMISSION OF J. ENGELHORN'S VER- 

 LAG IN STUTTGART.) 



1-5, Coscinodiscus ; 6, Asteromphalus ; 7, Fragilaria antarctica ; 

 8, 9, Synedra ; 10, Rhizosolenia ; n, Chaetoceras ; 12, Navi- 

 cula (?) ; 13, Dictyocha ; 14, a broken Radiolarian. 



FIG. 162. DEAD SHELLS OF GLOBIGERINA, THE SPINES OF WHICH 

 HAVE BEEN DISSOLVED IN THEIR FALL TO THE BOTTOM 

 (" CHALLENGER ") . 



