16 K. OKAMURA. 



d : basal portion of spine of the same specimen as fig. c. 4- x E, 



Zeiss. 

 e : endospores ; size : 20 X 26 p. 4xE, Zeiss. 

 fg : parts of two cells of var. hispida. 4xD, Zeiss. 



Plate XI. 



Fig. 30 : Chaetoceras sociale Lauder, oc. 3, obj. 8, Leiz. 



Fig. 31, a, b: endospores of Chaetoceras Lorenzianus Grun. 4 x D, Zeiss. 



Fig. 32 : Schmidtiella elongata Schrod. x ? 



Fig. 33, a-d : Eucampia Zodiacus Ehrenb. 



a : portion of a chain viewed from broader side of girdle. 4 X D, 



Zeiss. 

 b : the same viewed from upper side of girdle. 4 x D, Zeiss. 

 c : surface view of valve 4 x D, Zeiss. 

 d : optical section through sagittal longitudinal plane. 4 x D, 



Zeiss, 

 e : E. Zodiacus Ehrenb. forma Schrod. oc. 1, obj. 7, Leiz. 

 Fig. 34 : Eucampia cornuta (Cleve) Grun. 4 x E, Zeiss. 

 Fig. 35, a : chain of Eucampia biconcava (Cleve) Ostf. 2 X D, Zeiss. 

 h : one of the cells of the same as fig. a. 4 x D, Zeiss. 

 c : portion of another chain. 4 X E, Zeiss 

 Fig. 36 : Climacodium Frauenfeldianum Grun. 1 x D, Zeiss. 

 Fig. 37 a : Ditvlium Sol Van Heurck. 4 x D, Zeiss. 



b : surface view of the valve of the same specimen as f. a. 4 x D, 



Zeiss, 

 c: surface view of the valve of another specimen. 4 x D, 

 Zeiss. 

 Fig. 38, a, b : two cells of Triceratium tumescens Castr. 2 x E, Zeiss. 

 c : diagramatic representation of girdle-view of fig. b. Moder- 

 ately magd. 



Plate XII. 



Fig. 39, a : gridle-view of a chain of Triceratium arcticum Brightw. 

 var. japonic a Schmidt. 4 x B, Zeiss. 

 b : surface- view of the valve of fig. a. 4 x E, Zeiss, 

 c : surface-view of the valve of another specimen. 2 x D, Zeiss. 

 Fig. 40, a : Surface-view of Triceratium (Amphitetras) cuspidatum 

 Janisch viewed from the valve. 4x D, Ziess. 

 b : girdle-view of the same. 4 X D, Zeiss. 





