23 
lateral, sessile, or cut off by a septum from the upper portion of a 
lateral branch, in which numerous spermatozoids are generated, which 
at length become free. Spermatozoids oblong, furnished with two 
wequal cilia (except in one species).—Cooke’s British Freshwater 
Algew, 115. 
VAUCHERTA, DC. 
(Characters the same as given above for the family.) 
_ The following is an abstract given by Dr. Cooke, l.c., of Dr. N. 
Pringsheim’ s description of the sexual reproduction in Vawcheria :— 
= first turn ; but the period at which it arises is very indeterminate, 
or it sometimes appears much earlier, whilst the hornlet is still per- 
___ “The papilla destined to become thesporangium gradually pare 
eding 
: € hornlet in width, whilst in length it is barely equal to the straight 
imb of the latter. This outgrowth, which is afterwards symmetrical, 
acq 
table ovule. Up to this period the hornlet as well as the sporangrum 
ity of the hornlet 
the ooules constitute a dense lining to the tube, the sporangium, and 
col ornlet. Between this and the cellulose membrane is the thin, 
0 ourless cutaneous layer. 
g At this stage a septum is suddenly formed at the base of the 
ni Tangium, which is henceforth an independent cell, completely 
Parated from the parent tube. Even before this separation there 
ac 
: he formation of the septum between 
Porangium and the tube, and, in consequence of its continued 
