PLANKTON OF THE GULF OF MAINE 



Section 2. — General survey of the plank- Page 

 tonic plants, etc. — Continued. 

 Diatoms — Continued. 



Notes on the dominant genera of 



diatoms 43 1 



Asterionella 43 1 



Biddulphia . 432 



Chsetoceras 433 



Coscinodiscus 436 



Coscinosira 438 



Ditylium 438 



Eucampia 440 



Guinardia 440 



Lauderia 44 1 



Nitschia 44 1 



Rhizosolenia 442 



Skeletonema 448 



Thalassiosira 449 



3 



Section 2. — General survey of the plank- Page 

 tonic plants, etc. — Continued. 

 Diatoms — Continued. 



Notes on the dominant genera of 

 diatoms — Continued. 



Thalassiothrix 454 



Other diatoms 457 



Notes on other unicellular plants and 



animals 458 



Phaeocystis 458 



H alosphsera 459 



Acantharian radiolarians 460 



Tintinnids.. 463 



Other unicellular organisms 465 



Notes on the biology of the phytoplank- 



ton 465 



Bibliography 487 



