— 175 — 
octogibbosum Reinsch 1. ec. p. 112, t. X, f. 1. C. octogibbosum (Reinsch) 
Turner 1893. C. octogibbosum var. indica Turn. 
Forma depressa West &G.S. West in Journ. Bot. April 1897, p. 119. 
Long. 14,5—15,5 w; lat. 13,5—t4y; lat. isthm. 5p. 
Area: Europe, W. and E. Africa (vars.), India and Ceylon (forms), Burmah, 
E. Indies (var.), Central China, New Zealand. 
72. ©. Meneghinii Bréb. in Ralfs Brit. Desm. 1848, p. 96, t. XV, f. 6. 
Long. 22 y; lat. 164; lat. isthm. 4,5 py. 
Forma: cells narrower and semicells more rounded. 
Long. 1819 »; lat. 12,5—135 4; lat. isthm. 3,5—3,8 4; crass. 8 y. 
In stagnant water in the jungle with the preceding species. 
Area: Ubiquitous. 
73. €. angulosum Bréb. in Mém. Soc. Sci. Nat. Cherbourg, IV, 1856, 
p. 127, t.1, f.17. C. Meneghinii Bréb. var. angulosum Rabenh. 1868. 
Var. concinnum West & G.S.'West. C. concinnum Reinsch. 
Long. 124; lat. 10; lat. isthm. 2,6 p. 
In stagnant water amongst Spirogyra. 
Area: Europe, N. America, Madagascar. W. Africa. 
74, €. pusillum Arch. in Pritch. Infus. 1861, p. 731. Euastrum 
pusillum Bréb. 1856. 
Long. 124; lat. 11; lat. isthm. 4,5 p. 
Area: Europe, S. America, India, Ceylon, N. Zealand. 
75. €. contraetum Kirchn. Alg. Schlesien, Breslau 1878, p. 147; 
Wolle Desm. U.S. 1884, p. 68, t. 50, f. 24. 
Forma minor: long. 26 2; lat. 20 yu; lat. isthm. 3,8 #; crass. 13 p. 
Except for its rather more open sinus this form is identical with that 
known as C. ellipsoideum Elfv. forma minor Racib. in Pamietnik Akad. 
Umiej. w Krakowie, Wydz. matem.-prz. X, 1885, p. 84, t. X, £9. (=C. 
proteiforme Turner in Kongl. Sv. Vet.-Akad. Hand]. Bd. XXV, no. 5, 1893, 
p. 64, t. IX. f. 26). 
C. ellipsoideum Elfv. does not differ sufficiently from C. contractum 
Kirchn. to warrant its separation as a distinct species. 
In stagnant water in the jungle. 
Area: Generally distributed. 
76. (. emarginatum West & G. S. West in Trans. Linn. Soc. bot. 
ser. 2, V, 1895, p. 58, t. VIII, f. 14. 
Long. 9—10 y; lat. 8,3—9,5 #; lat. isthm. 4,42; crass. 4,6 py. 
With the preceding species. 
Area: Madagascar. E. Africa (var.). 
Botanisk Tidsskrift. 24. Bind. 412 
