SHOWING STRUCTURE. FROM THE RHYNIE CHERT BED, ABERDEENSHIRE. 877 
dome-shaped cell, and was evidently of limited growth (cf figs. 99 and 100 and text- 
fig. 6). No branching of the simply septate filaments has been seen. In some 
specimens, however, as at b in. fig. 98 (cf fig. 101 and text-fig. 7) a node of small 
cells is found in the course of a filament, and there are indications of the nodal cells 
Figs. 6-11 show details of specimens of Algites ( Palxonitella ) Cranii ; Figs. 1-5 are of some specimens received from 
Mr Cran which we place with this plant. Cell-walls shown in another focal plane are dotted. 
1. Outline of the verticillately branched axis represented in figs. 91-93. After Mr Cran’s drawing, x 155. 
2. Outline of the specimen represented in fig. 95. After Mr Gran’s drawing, x 125. 
3. Outline drawing of portion of the specimen represented in fig. 96. X 165. 
4. Outline drawing of the specimen represented in fig. 94. xl6f>. 
5. A specimen that may be a longitudinal section of a node similar to those in text-figs. 1 and 4. After 
Mr Oran’s drawing. xll5. Slide 2573. 
6. Apex of filament shown in fig. 98 at (a), x 165. 
7. Outline drawing of nodal disc shown in fig. 98 at ( b ) and in fig. 101. x 165. 
8. Outline drawing of another node from the same slide, x 165. 
9. Outline drawing of the rhizoid node shown in fig. 103. x 165. 
10. Outline drawing of the rhizoid node shown in fig. 104. x 165. 
11. Outline drawing of another rhizoid node. X165. Slide 2546. 
growing out as branches. In text-fig. 8 a second example of a shallow nodal disc 
separating two of the large cells is represented. Another case of the existence of a 
node of small cells accompanied by branching is seen at c in fig. 98 ( cf. fig. 102) ; 
there are certain resemblances in this specimen to the rhizoids to be described 
