82 MR. G. 8S, WEST ON THE FRESHWATER ALGJE 
small number of Desmids, these plants show more decided geographical 
peculiarities than are to be found among the members of any other large 
group of Algse. Even with the present state of our knowledge there is 
evidence which indicates a very definite Indo-Malayan region, extending to 
North Queensland, and characterized by certain well-marked types; a second 
one comprising much of North America and N.W. Europe; and also a third, 
South-American region, which possibly extends into the South Australian 
area. The African region may probably embrace Madagascar, and there is 
also much similarity between some of the Madagascar Desmids and those of 
Ceylon. More collections of Alg from Tropical Africa are urgently required 
consisting of material obtained by carefully squeezing and stripping the 
aquatic phanerogams and submerged mosses of the swamps. 
Only a small proportion of Dr. Cunnington's material was from swamps, 
and much of that which had been collected from such situations consisted 
merely of floating Algee. This at once explains the fact that the Desmidiaceæ 
recorded in this paper are in no way striking, or, with few exceptions, 
particularly representative of the African region. Those which may be 
regarded as of a distinctly African type are the following :— 
Еиаятит hypochondroides, W. & С. 8. W. 
E. personatum, W. & G. S. W. 
Е. pseudopectinatum, Schmidle. 
Cosmarium glyptodermum, W. & G. S. W. 
C. planum, W. & С. S. W. 
C. subauriculatum, W. & G. S. W. 
C. multiordinatum, W. & G. S. W. 
С. subconstrictum, Schmidle. 
Staurastrum limneticum, Schmidle. 
S. gracile, Ralfs, var. subornatum, Schmidle. 
Five Desmids and two filamentous Conjugates Г have described as new 
species. 
Of the Chlorophycez other than the Conjugate, GZdogontum Kurzii, Zeller, 
and Chodatella subsalsa, Lemm., are both very interesting species, and seven 
others I have described as new ; one—Sphinctosiphon polymorphus, from the 
plankton of Victoria Nyanza—having had to be regarded as the type of а 
new genus. Of the other new forms of green Algo, Colastrum compositum 
differs from all other described species of the genus in the composite grouping 
of its cells. 
The Diatoms were both numerous and peculiar, ten species not agreeing 
with any previously described. The Diatoms of the plankton are particularly 
noteworthy, especially those of the family Surirellacem. 
Numerous Myxophycesx (or blue-green Algs) were present both in the 
plankton and the other collections. The genera Anabena, Calothriz, Lyngbya, 
