Fig. 69 



Plate XIV. 



— Campylodiscus coronilla^ Brun. 

 ( '. Califomicus (Grove), Deby. 

 — C. Afacassarensi > (Grove), Deby, 

 — C. trapezoidaliS) Deby. 

 vtarginatus, Deby. 

 — C. dentatuS) Deby. 



All the Figures on this Plate and in the next arc from Photo- 

 graphs, most kindly taken for me from the original diatoms by 

 Mr. Comber, Mr. Xeilson, and Mr. Pringle. The very irregular 

 shape of the frustules ^i the Campylodisci renders it quite impos- 

 sible to focus the whole surface simultaneously, even under low- 

 powers of the microscope. This is the reason which explains the 

 deficiencies of our figures, some portions of all of which were out 

 of focus, while other portions were distinct. These latter alone 

 should be examined by means of a pocket-lens. These figures are 

 magnified about 200 diam. 



