ON PROTOPLASMIC CONTINUITY IN THE FLORIDE. 69 
; n the protoplasm escapes from the cells it may or may not 
gery P with it the lenticular body. In the former case there is an 
_ open communication between cell and cell, which is very obvious 
: _ when the re wall is stained. 
q ical cells are much smaller than those already 
a ' described, or their walls attain some thickness, and their contents 
_ connected throughout, in a similar manner to that now under 
- notice. 
8. LAURENCIA. 
q As regards protoplasmic continuity, Laurencia is one of 
Most interesting genera yet dealt with. One of the commoner 
arge cells, which are elongated longitudinally, and are circular in 
the transverse section, while the cortex is composed t. cells that 
are shorter and more densely packed, but otherwise of a similar 
character. Owing to the great degree of thickening which the 
; walls undergo, the seotoplenias contents of the cells often become 
reduced to a mere band or thread, and then in transverse section 
they appear as a small particle in the centre of the cell lumen. 
rom the sictenlaciic body of each cell several processes are given 
off, which run along channels or pits in the thickened wall, and 
ive the contents the appearance of a Bhizo od. On reaching the 
the cell each thread expands into a small circular 
u ert 
9. Prrrocetis. 
Petrocelis cruenta I. Ag. (Cruoria pellita Harv.) forms horizontal 
Pee om nocons fronds, which expand indefinitely in outline, 
nd grow attached to rocks between high and low water-mark. 
and below by an extremely fine ate or ag res 
hg cells at the base of filaments are also connected in 
ner, 7 hear is as ae here as in that ican 
ide Plate 244, fig. 15. 
10. FresawatEr Fioripez. 
Of freshwater Floridee the only genera examined, and that 
) hewhat eursorily, are Batrachospermum and Chantransia, The 
