BIGELOW: COAST WATER EXPLORATION OF 1913. ool 
 toceras can be distinguished. Mixed plankton (Fig. 82) partly diatom, 
\ 
+ 
i 
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, 
Fig. 82.— Distribution of different types of microplankton, July—August, 
1913. 
c, Ceratium plankton; M, mixed; p, Diatom; ...., northern limit to 
Ceratium macroceros 
; s. limit to c, longipes. 
/ 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 
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