52 
Review. 
As regards the morphological features of Chlorophyceae, apart 
from the main criticism already made, we have not much to add. 
We are astonished to find no reference to Senn’s work on 
Protococcales, nor to Berthold’s “ Verzweigung einiger Suesswasser- 
algen.” The revelant papers are also not included in the 
bibliography ; other important contributions that we think should 
have been cited are Heinricher’s on Sphceroplea and Juranyi’s on 
Otdogonium. In dealing with the Chlamydomonadeae some 
reference should have been made to the relatively permanent 
Palmella-stagts of certain species of Chlamydomonns. The state¬ 
ment on p. 304 that Microthamnion is not attached at any time is 
surprising, as we have certainly found it growing as an epiphyte on 
other filamentous Algae. 
We have already commented on the very clear presentation 
of facts by the author, and we have noticed but very few failings 
in this respect in the section on Chlorophyceae. Attention may be 
drawn however to the confusing reference to fig. 149 on p. 127, 
to the remarks on the same page about differentiation of vegetative 
cells, where a mention of Dvaparnaldia would have seemed advisable, 
and to the statement on p. 301 as to incrustation with lime of the 
thallus in Pleurothcunnion, which is not only the genus of the 
particular sub-family exhibiting this phenomenon. 
Professor West concludes the volume with a section on the 
occurrence and distribution of freshwater Algae, and a number of 
data of a similar kind are included in various other portions of the 
work. The author’s classification of the Algae according to habitat 
will be of great value to the algal student, but we cannot help 
feeling that with Professor West’s wide experience a more truly 
ecological account of freshwater Algae would have been possible. In 
particular we miss any considerable attempt at analysis of the factors 
appertaining to the different habitats; some reference should also 
have been made to Comere’s work in this direction. It is stated on 
p. 427 that according to Fritsch and Rich the autumnal phase of 
Spirogyra is the result of the germination of a certain percentage 
of the zygospores formed in spring. It has however escaped 
Professor West’s notice that the authors in question in their 
subsequent papers have corrected this statement and now regard 
the autumnal phase as solely due to persistence of a number of 
vegetative filaments. F.E.F. 
