PLATE 18 

 Peridinium granii Pauls 



Fig. 3. Dorso-ai)ical view of the same specimen shown in figure 1, plate 17. 

 X 1500. 



Note that the dorsal epithecal plate jjattern is that which has been termed 

 the left oblique pattern. The ventral plate pattern is that of the subgenus, 

 Metaperidinium. 



Fig. 4. Dorso-apical view of the same specimen shown in figure 2, plate 17. 

 X 1500. 



Note that the dorsal epithecal plate is asymmetrical and the reverse of that 

 found in a similar form from Sausalito, California. The dorsal plate pattern of 

 the form from Union Bay corresponds to the form of P. granii described by 

 Paulsen (1908, p. 52, fig. 66) from the Baltic Sea, but the ventral plate pattern 

 figured for the Baltic Sea is that of the subgenus, Paraperidinium. 



[474] 



