CHLOROPHYCE 4% 141 
It might, with almost equal fitness, be placed else- 
where. Its remains are in the form of small egg- 
shaped bodies with a hole at each end, and each of 
these is taken by Munier Chalmas to represent the 
beads in the filaments of a 
Penicillus-like plant. 
In Rhipocephalus there is an 
erect incrusted stalk giving off 
at intervals numerous small 
fronds also incrusted, composed 
of dichotomous filaments. It 
forms a transition to the next 
genus. ® 
Udotea has the same fan-like, 
stalked fronds as Avrainvillea, 
but in this case they are in- 
crusted, in some species very 
little, in others thickly. The 
filaments are little interwoven, 
but in addition to the incrusta- 
tion they are bound together 
by numerous short lateral 
branches terminating in hap- 
tera or sucker-like holdfasts. 
The fronds in some species are Pe ae sete 
beautifully zoned, and there is Pienie one-half the natural 
in nearly all a tendency, more 
or less marked, to proliferation at the margin. The 
round bodies, figured by Kiitzing, which have been 
taken to be zoosporangia, are probably of foreign 
origin. 
Halimeda is the most singular of the group in the 
