238 THE JOURNAL OF BOTANY 
the expedition. The majority of the Alge collected were brackish 
forms, the only freshwater species being obtained from near the 
mouth of the Wady. 
E LITTORAL A-FLORA.—Included in this section are all 
those Algz attached to stones on the shores of the lake, those 
floating in shallow water near or thrown up on the 
for ntermor mosa Kiutz., which showed considerable 
variability in its characters. Amongst it were numerous Diatoms, 
especially Nitzschia plana W.Sm., a variety of N. Sigma W. Sm., 
avicula avenacea Bréb., the latter frequently forming a thick, 
yellow-brown stratum. Gyrosigma elongatum (W. Sm.) G. § 
est was also conspicuously present, and numerous threads of 
Spirulina subtilissima Kiitz. occurred in the diatomaceous stratum 
which covered some of the stones. 
occupied by the Cladophora, and many Diatoms found a home in 
this stratum. 
was not uncommon, and Polysiphonia utricularis Zan. was found 
floating in shallow water, mixed with filaments of Enteromorpha 
plumosa Kiitz. Epiphytic on the Polysiphonia were large numbers 
of Cocconeis Placentula Ehrenb. and Asterocystis smaragdina 
(Reinsch) Forti. 
Thrown up on the beach were numerous pieces of the felty 
na. 
THe Pranxron (in April, 1907) consisted for the most part of 
immense numbers of Entomostraca and Rotifers. Among this 
teeming animal life was a somewhat meagre phytoplankton com- 
prising only three species of Diatoms. These were Campylodiscus 
Clypeus Ehrenb., Melosira Borreri Grev., and Nitzschia Palea 
(Kiitz.) Grun. The two former were fairly abundant, but the 
last-named was very rare. 
Swampy Ponps at tHE Mourn or Wapy (fresh water). Some 
swampy ponds near the mouth of the Wady were much less 
