CHLOROPHYCE.X® 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 Ceratiwm occur on the British 
Fic, 56.—a, Ceratium 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 Ceratiwm Tripos in catena (Fig. 56) 
