PHYTOPLANKTON FROM THE ALBERT NYANZA 245 
Schmidle (a somewhat reduced form, 5-radiate; long. 33 p, lat 
c. proc. 52-56 p), Volvox aureus Ehrenb. (a form rm), Pai ieian 
a 
simplex : dup , and var. reticulatwm Lagerh., 
P. Boryanwm (Turp.) Menegh., and var. rugulosum G. 8. West, 
Celastrum peste Arch., C. retiewlatum g.) Senn, Scene- 
desmvus acutiformis Schréder var. a (Bohlin 
West, S. Pantie Lagerh., S. obliquus ( iitz., S. quadri- 
cauda , all aks: (Richter) << G. 
i ‘ Ss. 
West, Ankistrodesmus convolutus (Rabenh.) G. 8. West, A. faleatus 
(Corda) Ralfs var. acicularis (A. Br.) G. S. hele | Kirchneriela 
& S. Wes 
Her ee — Ophiocytiwm gtnicd Wolle var. longi- 
spinum Lem 
Bieatlace 1nai.—Melosira nyassensis O. Miull., M. granulata 
Ralfs, Cyclotella Kiitzingiana Chauvin, Synedra Ulna (Nitzsch) 
ele =k Cunningtoni G.S. West, Byres Placentula Ehrenb., 
a acrospheria (Bréb.) Kiitz., Stawroneis ee: omar 
(Nitesch) ae renb., Vanheurckia africana <P. n., oy! ma frag 
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max. 44 x), Cymatopleura So 
Myxopuycem.— Lyngbya state ei Oscillatoria prin- 
ceps Vauch., O. tenuis Ag., O. formosa Bory, Merismopedia 
elegans A. Br. (colonies with upwards of 3000 cells), Microcystis 
densa, sp. n 
pena helty. Da cig pulviseulus (Ehrenb.) Stein, Peri- 
dinium inconspicuwm 
LVOx AUREUS Ehrenb. The specimens differed in several 
particulars from the European forms of this species. The num 
of daughter- a developed within the mother-colony were 
fewer than is usually the case, and their growth is such that 
they become ellipsoid or ovoid by compression before being 
- free. I hope to deal specially with this form at a subsequent 
ate. 
TETR meee TETRAGONUM (Niig.) Hansg. forma ARTHRODESMI- 
FORME, oon in aspectu generali ad speciem Arthrodesmi 
accedens; in pa si mediana subconstricta, angulis in spinos elon- 
gatos subparallelos productis. Lat. cell. sine spin. 16-22 »; lat. 
max. cum spin. 56 pw. (Fig. 1.) 
