BIGELOW: COAST WATER EXPLORATION OF 1913. 



331 



toceras can be distinguished. Mixed plankton (Fig. 82) partly diatom, 

 partly peridinian, was found just north of George's Bank (no doubt the 

 effect of the diatom swarm on the Bank) ; south of Nantucket Shoals 

 (Station 10061), and at all the Stations close to land south of New 

 York, except where the plankton was purely diatom (10069, 10072, 



IG. 82, 

 1913. 



c, Ceratium plankton; M, mixed; d, Diatom; . . . . 

 Ceratium macroceros ; s. limit to c, longipes 



Distribution of different types of microplankton, July- August, 



. , northern limit to 



10079, 10080, 10081). The plankton along the outer part of the con- 

 tinental shelf, south of Delaware Bay (Stations 10073, 10074) was also 

 of this type. In the Gulf of Maine mixed plankton was encountered 

 on German Bank (Station 10095) ; near shore east of Mt. Desert 

 Island; and again north of Cape Ann (Station 10105). There were 



