244 Mr. R. Bullen Newton on some 
My grateful thanks are due for the following additional 
and more technical notes on the Charophyte-remains con- 
tained in these rocks, which have been kindly drawn up by 
Mr. James Groves, F.L.S., one of our chief authorities on the 
morphology of recent Characeous Plants :— 
Rock no. 1850.—This shows what is probably an oospore 
with a dark margin representing a section of the enclosing 
spiral cells which constitute the oogonium-sac. Itis of small 
dimensions, being about *45x°35 mm. The spaces between 
the spiral lines are somewhat convex, although this may 
be due to being chalcedonized. ‘The outline of the margin 
corresponds roughly with the impressions of associated oogonia 
measuring ‘775x°525 mm. There is another supposed 
oogonium or a larger oospore about two-fifths of which is 
exposed, having a definite surrounding margin of dark 
mineralized matter and showing a diameter of °425mm. The 
crushed oogonium (or oospore) in close proximity has, appa- 
rently, a much tapered base (PI. VIII. fig. 6). 
Rock no. 1851.—Contains a large oogonium, which, on 
account of its size, would be a different species to that seen in 
no. 1350. It is probably 1x°6 mm. The branchlets near 
by are about ‘26-3 mm. in diameter. A microscopical slide 
cut from this rock exhibits a good diagonal section of a 
branchlet (or small stem) with a diameter of about ‘4 mm. 
and possessing a probable diplostichous cortex, as it consists 
of about fourteen cells in section (PJ. VIII. fig. 7). Certain 
small cylinders, considered to be bract-cells, show a diameter 
of about *2—3 mm., but no branchlet-node was observed. 
Another stem or branchlet section gives a diameter of about 
‘6mm. A further microscopical slide shows a good trans- 
verse section of stem with a diameter (including cortex) of 
about ‘45 mm. ‘The cortex is almost certainly diplostichous, 
cells fourteen and of nearly equal diameter (‘03 mm.). The 
smaller ecorticate sections may be both branchlets and bract- 
cells, although, from their position, there is no indication of 
whorls. 
Rock no. 1852.—The Chara remains on the surface of this 
specimen belonged probably to a medium-sized plant of about 
the stature of the living Chara vulgaris. 
Stem moderately stout, about ‘65-90 mm. in diameter. 
Cortex triplostichous, rather irregular, primary series some- 
times much the larger, but secondary cells of varying diameter. 
No cortex nodes determinable. 
