﻿Flo, 



KiG. 2. Fig. 3. 



2.— Section of part of Cryptozoon proliferum, Hall, x 48, showing two of the 



primary laminae at (a, a), and portions of three of the eanaliferous layers. 



3.— Section of part of C. Occirtentale, S.?f., x 48, showing one of the primary 



laminae at (a), and portions of two of the cellnlar and eanaliferous layers. 



(From micro-photographs by Prof. Penhallow.) 



