CHLOROPHYCE.E 



183 



The Geographical Distribution of the marine forms 

 is principally in the temperate waters of the ocean, 

 more abundantly in coastal waters than far from 

 land. Vast banks of Ceratium occur on the British 



Fio. 56. a, Ceratinm Tripos (in catena), after J. Murray ; b, single Ceratium 

 Both highly magnified. (After Schiitt.) 



coasts, causing the waters to be brightly luminous at 

 night. They form, with the Diatoms, a very large 

 proportion of the primary food of marine animals. 

 The occurrence of Qcratium Tripos in qatena (Fig. 56) 



