sep (Roos 
Var. linearis Hansg. in Archiv Naturwiss. Landesdurchf. Béhm. Bd. 6, 
1888, p. 268. 
In muddy ricefields. 
Area: Europe, N. America, W. Africa, Madagascar, Ceylon. 
104. §. aeutiformis Schréder in Forschungsberichten der Pléner 
Biol. Stat. Heft 5, 1897, p.17, t. I, f. 4. 
Var. spinuliferum West & G.S. West n. var. (Tab. nostr. IV, fig. 46 
—49.) 
Var. ceenobiis e cellulis 2—8 (plerumque 4) constitutis; polis 
cellularum spinis curvatis minutis 2—3 instructis. 
Long. cell. sine spin. 14—24 4; lat. cell. 3,2—8,5 4; long. spin. 
1—5,7 ps. 
This variety occurred in large quantity amongst other Palmellacew in 
stagnant water. The coenobia were of all sizes and contained from two 
to eight cells. All the cells possessed the lateral ridges characteristic of 
this species. The small spines were very variable in number and position, 
but were always of appreciable length and generally considerably curved. 
It bears a considerable resemblance to S. denticulatus var. linearis 
Hansg., but is readily distinguished by the two prominent ridges -on each 
cell of the ccenobium. The spines at the poles of each cell are also 
longer and more curved than in S. denticulatus Lagerh. 
105. §. quadricauda (Turp.) Bréb, in Mém. Soe. se. nat. Falaise, 
bot. 1835, p. 66: Ralfs Brit. Desm. 1848, p. 180, t. XXXI, f. 12. 
In stagnant water in riverbed. 
Area: Ubiquitous. 
Rhaphidium Kiitz. 
106. R. pelymorphum Fresen. in Abhandl. der Senckenb. naturf. 
Gesellsch. Il, p. 199, t. VIE. 
Var. aciculare (A. Br.) Rabenh. Flor. Europ. Algar. I, p. 45. 
In stagnant water in the. jungle. 
Var. faleatum (Corda) Rabenh. 1. c. 
With the preceding variety. 
Area: This species and its varieties are ubiquitous. 
107. R. convolutum (Corda) Rabenh. 1. c¢. p. 46. 
Lat. cell. 3,8 pn. 
With the preceding species. 
Area: Europe. 
Selenastrum Reinsch. 
108. §S. gracile Reinsch. in Abhandl. Naturhist. Gesellsch. zu -Nirn- 
berg, Ill, 1866, p. 63, t.IV, f. 3a—0. 
