OF THE THIRD TANGANYIKA EXPEDITION. 125 
113. STAURASTRUM ORBICULARE, ( Ehrenb.) Menegh. in Linnea, xiv. (1840) 
p. 225; Nordst. in Wittr., Nordst. 9 Lagerh. Alg. Ewsie. fasc. 85 (1908) 
pp. 9-10 (с. fig.). 
Var. DEPRESSUM, Roy d Biss. in Journ. Bot. xxiv. (1886) p. 237, 
$. 268. fig. 14. 
Tanganyika.—In swamp, Kituta (23 Aug. 1904 ; no. 72). 
Victoria Nyanza—Among Utricularia, near Entebbe (1 May, 1905; 
no. 620). 
114. SrAURAsTRUM tURGESCENS, De Not. Desm. Ital. (1867) p. 51, t. 4. 
fig. 43; W. § 6. S. West, in Trans. Roy. Irish. Acad. xxxii. sect. В (1902), 
p. 50, t. 2. fig. 32. 
Forma minor: long. 28 ш; lat. 25 p; lat. isthm. 10 р. 
Nyasa.—In shore pools, Nkata Bay (23 June, 1904; no. 22). 
115. ЗТАСВАЗТВОМ PUNOTULATUM, Breb. in Ralfs, Brit. Desm. (1848) 
p. 113, t. 22. fig. 1. 
Victoria Nyanza.—In swampy pools, Bukoba (20 Apr. 1905 ; no. 251). 
116. STAURASTRUM ALTERNANS, Bréb. in Ralfs, l. с. р. 132, t. 21. fig. T. 
Tanganyika.—In plankton, Kalambo (5 Nov. 1904 ; no. 154). 
117. SrAURASTRUM SINENSE, Lütkem. in Ann. des К-К. Naturhist. Hofmus. 
Wien, xv. (1900) p. 124, t. 6. figs. 39, 40. 
Long. 18-18:5 р; lat. 18-23 д; lat. isthm. 7 ya. 
Victoria Nyanza—Among Utricularia, near Entebbe (1 May, 1905; 
no. 620). 
118. SravRA&TRUM PILOSUM, (JVág.) Arch. in Pritch. Infus. (1861) p. 739.— 
Phycastrum pilosum, Mig. Gatt. ета. Alg. 1849, p. 126, t. 8 A. fig. 4. 
Var. MINIMUM, var. п. (Pl. 6. fig. 5.) 
Var. perparva, spinis ut in forma typica sed minoribus. 
Long. sine spin. 22 и, cum spin. 25 ш; lat. sine spin. 20-22 u, cum spin. 
25 ш; lat. із. 6 p. 
Victoria Nyanza.—Swampy pool, Bukoba (20 Apr. 1305 ; no. 618). 
119. SrAvnAsTRUM ECHINATUM, Breb. in Ralfs, Brit. Desm. (1848) p. 215, 
t. 35. fig. 24 (figure poor); W. $ G. 5. West, in Bot. Tidsskr. xxiv. (1901) 
p. 177, t. д. fig. 31. 
Small form: long. sine spin. 26 м, cum spin. 314; lat. sine spin. 23 р, cum 
spin. 32 ш; lat. isthm. 8 p. 
Victoria Nyanza.— With the preceding species (no. 618). 
Except for being slightly smaller, the specimens agreed very well with 
those observed from Siam. The cells were of the same form, and the spines 
were of the same size and length. 
