— 183 — 
In stagnant water, scarce. 
Area: Europe, 8. America, Abyssinia, India. 
Tetraédron Kiitz. 
109. TT. regulare Kiitz. Phyc. Germ. p.129. Polyedrium tetraédri- 
cum Nag. Gait. einzell. Alg. 1849, p. 84, t IVB, f. 3. 
Diam, 22—93 2. 
Area; Europe, N. and S. America, W. Indies, E. Africa, Abyssinia, Kordofan. 
110. TT. bifureatum Lagerh. in Nuova Notarisia 1893, p. 160. Po- 
lyedrium tetraédricum Nag. var. bifurcatum Wille. 
Diam. sine spin. 388—46 », cum. spin. 50—59 yw. (Tab. nostr. IV, 
fig. 50.) 
Area: N. and 8. America, W. Indies, Abyssinia, Kordofan. 
111. 'T. octaédricum (Reinsch) Hansg. in Hedwigia 1888, p. 131. 
Polyedrium octaédricum Reinsch. 
Diam. 25-—27 ys. 
Var. spinosum. LP. octaédricum var. spinoswm Reinsch. 
Diam. sine spin. 21—26 y, cum spin. 32—38 yp. 
Area: Europe. 
112. TT. cruciatum West & G.S. West. Micrasterias cruciata Wal- 
lich in Ann, Mag. Nat. Hist. ser. 3, vol. V, 1860, p. 281, te XIII, f. 12; 
Staurophanum cruciatum Turn. in Kongl. Sv. Vet.-Akad. Handl. Bd. 25, 
no. 5, 1893, p. 159, t. XX, f.20, 91. 
Diam. 52—54 p. (Tab. nostr. IV, fig. 51.) 
The eight angles were bifurcate (not trifurcate) and a few of the 
spines were again furcate. 
Amongst various Desmids, Scenedesmus, etc., in stagnant water in the jungle. 
Area: India, Ceylon. 
‘Reinschiella De Toni. 
113. R.siamensis West & G.S. West, n.sp. (Tab. nostr. IV, fig. 52.) 
Cellulee magnze, solitarize et libere natantes, late lunato-lanceo- 
late, margine exteriori multum convexo, margine interiori subrecto 
et levissime retuso, apicibus productis in spinas longas gracillimas 
et recurvatas. 
Long. sine spin. 77»; lat. 28; long. spin. circ. 17—52 p. 
Apparently a distinct species nearest to I. crassispina De Toni. 
With various Desmids amongst Spirogyra decimina var. in stagnant water. 
