120 МВ. G. 5. WEST ON THE FRESHWATER ALGE 
(interdum levissime retusis), lateribus subrectis vel levissime convexis, 
angulis superioribus subrotundatis, apice subtruncato-convexo, infra et juxta 
apicem granulis magnis binis ornate, granulo singulo ad angulis basalibus 
juxta sinum, et scrobieulis conspicuis quincuncialiter ordinatis in centro 
semicellule ; a vertice vise elliptice, polis levissime truncatis, intra marginem 
unumquemque granulis magnis binis instructe ; a latere vise oblongo- 
ellipticæ (vel elliptico-circularis), ad apicem utrinque granulo magno ornate ; 
pyrenoidibus binis. 
Long. 42—44}; lat. 31:5-32:5 ш; lat. isthm. 9 ш; crass. 19 p- 
Victoria Nyanza.—Among Utricularia, near Entebbe (1 May, 1905; 
no. 620). 
This species stands nearest to C. bigemma, Racib. (in Pamietnik matem.- 
przy. Akad.} Umiej. Krakow. xvii. (1889) p. 85, t. 5. fig. 10), from which 
it is distinguished by the truncate basal angles of the semicells, the smooth 
sides and slightly convex apex, as well as by the two pyrenoids in each 
chloroplast. 
It should also be compared with C. supergranatum, W. B. Turn., forma 
pulehrum, W. B. Turn. (in K. Sv. Vet-Akad. Handl. xxv. (1893) no. 5, 
р. 97, t. 9. fig. 24),and C. ceylanicum, W. & G. S. West (in Trans. Linn. Soc. 
ser. 2, Dot. vi. (1902) p. 174, t. 21. figs. 14, 15). 
92. COSMARIUM scABRATULUM, W. & G. 5. West, in Trans. Linn. Soc. 
ser. 2, Bot. v. (1895) р. 64, t. 6. fig. 27. 
Victoria Nyanza.—In swampy pools, Bukoba (20 Apr. 1905 ; no. 251). 
Tanganyika.—In swamp, Kituta (26 Aug. 1904 ; no. 80). 
95. COSMARIUM PRÆMORSUM, Bréb, in Mém. Soc. Sci. Nat. Cherb. iv. (1856) 
р. 128, t. 1. fig. 8; Nordst. in Act. Univ. Lund, ix. (1873) p. 12, t. 1. fig. 1. 
Victoria Nyanza.—In sheltered bay, near Entebbe (1 May, 1905; no. 620). 
94. COSMARIUM DECACHONDRUM, Roy $ Biss. in Journ. Bot. xxiv. (1886) 
p. 196, t. 268. fig. 15. 
Var. ORNATUM, var. п. (Pl. 7. fig. 8.) 
Var. semicellulis depressis, granulis infra sed juxta apicem majoribus et 
conspicuis, eum granulum supra isthmum et granulis duobus apicem versus. 
Long. 26 u ; lat. 26-29 ш; lat. isthm. 9 № 5 crass. 17 д. 
Victoria Nyanza.—A mong Utricularia, near Entebbe (1 Мау, 1905; по.620). 
This variety differs from the type in the somewhat flattened apices, the 
more conspicuous apical granules, the single granule above the isthmus, 
and the two granules below the apex of the semicells.  Schmidle has described 
a var. striatum of this species from Zanzibar and Mozambique. 
It is closely allied to varieties of С. taxichondrum, Lund., especially to 
var. subundulatum, Boldt, and its form subdenticulatum, W. & С. S. West. 
