Journ. Q.M.C. 



Ser. 2, Vol. XII , PI. 14 



1 



ill 



ll III 



will 



I 



.Hi! 



! 



Pliilli 



.: 



I 



it: 



!!i 







t 



III* 



Fig. 1. 



Fig. 3. 



Fig-. 



Fig. 2. 

 Photomicrogr. T. A. OD. 



Structure of Pleurosigma balticum. 



