180 
Nellie Carter. 
In all cases the transference of the material from one liquid to 
another was made as gradual as possible, and the strength of the 
solution was rarely increased by more than 10% at a time. 
Fig. 1. Cliaraciopsis Nagelii (A. Br.) Letnm. A and B, living individuals 
x510; C, 1) and E, stained specimens showing cavities in the protoplast 
caused by internal projections of the cell-wall x910; F and G, very young 
individuals x 910; H, I and J, transverse sections x 1720; K, surface 
longitudinal section, showing chromatophores x 1720; L, longitudinal 
section, showing vacuolate protoplast x 1720; M, section treated with 
chlor-zinc-iodine, showing the internal invagination of the cell-wall X 910; 
N, section through an internal projection created with chlor-zinc-iodine. and 
showing the space (s) between the layers of the cell-wall x 910; O, longi¬ 
tudinal section showing the protoplast and internal projection of the cell-wall 
X 910. chr, chromatophores ; v, vacuoles. 
Cliaraciopsis Ncegelii. 
The cell-wall of this species is of some thickness and is 
peculiar in the frequent production of internal processes penetra¬ 
ting the cell-cavity. These processes are not present in all 
specimens, but they are frequently found in the larger individuals. 
They vary in size from small button-like thickenings (Fig. 1, E and 
N) to fairly long tubular processes projecting half-way or even 
more through the cell (Fig. 1, M and O). Sometimes more of 
these projections than one are present in a single cell, cf. Fig. 1, 
C and E. On treating with chlor-zinc-iodine the wall increases 
