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OF THE THIRD TANGANYIKA EXPEDITION, 195 
PLATE 9. 
. Peridinium africanum, Lemm., sp. п. x 750. a, ventral view; 6, dorsal view; 
c, hypovalve; d, epivalve; e, cyst. (After drawings by Lemmermann.) 
. Peridiniopsis Cunningtonii, Lemm., sp. п. х 750. a, ventral view; b, dorsal view ; 
c, lateral view; d, epivalve; e, hypovalve. (After drawings by Lemmermann.) 
‚ Peridinium berolinense, Lemm., var. apiculatum, Lemm., var. п. х 750. а, dorsal 
view ; à, ventral view ; c, lateral view. (After drawings by Lemmermann.) 
. Ceratium  Hirundinella, О. Е. Müll. x 500. Small reduced form from Victoria 
Nyanza. The markings are only shown on a small portion of the cell. 
. Spirulina Princeps, W. & G. S. West. x 520, 
» laxissima, sp. п. х 1000. 
. Lyngbya circumcretum, вр. п. х 520. a, b, and c, three specimens to show the 
coiling of the filaments. 
. Anabena вр. X 520. Consult page 170, no. 290. 
. Oscillatoria Tanganyika, sp. n. х 500. а, b, and e, apices of three filaments; 
d, middle part of filament. The large granules are probably gas-vacuoles. 
PLATE 10. 
. Anabena Flos-aque, Bréb. forma. х 520. 
" » var. circularis, var. п. X 520. a-d show normal coiling, the 
short filaments being terminated at each end by a heterocyst; e, а straight 
filament. 
. Anabena Tanganyike, sp. п. x 520. d, filament with spore (sp.). 
. Anabena sp. х 520. Consult page 171, no. 294. 
. Gleotrichia longiarticulata, sp. п. a, floating colony, x 10; 4-d, bases of trichomes ; 
e and f, spores. 2-7, x 520. 
. Rivularia globiceps, sp. п. a, colonies attached to floating fragment of leaf, natural 
size; b-d, bases of trichomes. х 520. 
. Calothrix cartilaginea, sp. n. X 500. a-d, trichomes in different stages; e, middle 
portion of old trichome with well-marked sheath; f, hormcgone. 
‚ Calothrix brevissima, sp. п. a-e, group of complete filaments, х 500; d aud e each 
possess two basal heterocysts. 
ADDENDA. 
DESMIDIACEZ. 
318. PENIUM LAGENARIOIDES, Roy, in J. P. Bissett, ‘ Desm. Windermere,’ 
Journ. Roy. Micr. Soc. (1884) p. 197, t. 5. fig. 6. 
Var. SYDNEYENSE, Racib. т Hospraw. Wydz. matem.-przyr. Akad. Umiej, 
Krakow, xxii. (1892) p. 368, t. 6. fig. 3. 
Long. 74 р; lat. 29 д; lat. constrict. 26 ш; lat. аріс. 14 џ. 
Тапеапу а. — п swamp, Kituta (23 Aug. 1904 ; no. 72). 
