Si! 



' i! 



I 



i^il 





Fig. 7'' — Por/iono/ i/iinsedion of C>y/)/ozoon pro/i/c-rum {magml'icd x 50). 



(«) Corneous layers. («^) One of these dividing. (i5) Intermediate stroma with 

 granules of calcite, dolomite and quartz, traversed by canals. 



From a Micro-photograph by PROF, PenhaLLOW. 



{'I'o/ucc p. 39. 



! 



