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Occurrence of Tintinnus of Serratus 



13 



The yearly occurrence is shown in the following Table 



TABLE 2. 



Explanation of Table 2. 



c — collection taken but T. serratus not found, 

 n — no collection taken. 



The numbers indicate the individuals per liter, based upon the count- 

 ing of .25 cc. of sea water. Areas indicate definite locations. 



The occurrence is always on the surface except in one case, where 

 it occurred in 9 meters of water and only one individual was found 

 in 25 cc. of sea water. 



Though the organism occurs also in March, June, July and Octo- 

 ber, the maximum occurrence is in September. 



A study of the temperature relations shows that while the organism 

 has a range from 38.7° to 78.5° that the optimum lies from 70<'-75''. 

 The temperature data is tabulated in Table 3 and a graph is shoNvn 

 in Table 4. 



