- 175 — 



octogibbosum Reinsch 1. c. 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 } 5p; lat. 13,5 — 14//; lat. isthm. 5//. 



Area: Europe, W and E. Africa (vars.), India and Ceylon (forms), Burmah, 

 E. Indies (var.). Central China, New Zealand. 



72. C. Meneghinii Bréb. in Ralfs Brit. Desm. 1848, p. 96, t. XV, f. 6. 



Long. 22 //; lat. 16//; lat. isthm. 4,5//. 



Forma: cells narrower and semicells more rounded. 



Long. 18 — 19//; lat. 12,5— 135//; lat. isthm. 3,5—3,8//; crass. 8//. 



In stagnant water in the jungle with the preceding species. 

 Area: Ubiquitous. 



73. C. angulosum Bréb. in Mém. Soc. Sei. Nat. Cherbourg, IV, 1856, 

 p. 127, t. I, f. 17. C. Meneghinii Bréb. var. angulosum Rabenh. 1868. 



Var. concinnum West & G. S. West. C. continuum Reinsch. 



Long. 12//; lat. 10/.«; lat. isthm. 2,6//. 



In stagnant water amongst Spirogyra. 



Area: Europe, N. America, Madagascar. W.Africa. 



74. C. pusillum Arch, in Pritch. Infus. 1861, p. 731. Euastrum 

 pusillum Bréb. 1856. 



Long. 12//; lat. 11//; lat. isthm. 4,5 //. 



Area: Europe, S. America, India, Ceylon, N. Zealand. 



75. C. contractum Kirchn. Alg. Schlesien, Breslau 1878, p. 147; 

 Wolle Desm. U.S. 1884, p. 63, t. 50, f. 24. 



Forma minor: long. 26 // ; lat. 20//; lat. isthm. 3,8 // ; crass. 13//. 



Except for its rather more open sinus this form is identical with that 

 known as C. ellipsoideum Elf v. forma minor Racib. in Pamietnik Akad. 

 Umiej. w Krakowie, Wydz. matem.-prz. X, 1885, p. 84, t. X, f. 9. (== C. 

 proteiforme Turner in Kongl. Sv. Vet.-Akad. Handl. 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. C. emarginatum West & G. S. West in Trans. Linn. Soc. bot. 

 ser. 2, V, 1895, p. 58, t. VIII, f. 14. 



Long. 9 — 10/«; lat. 8,3 — 9,5//; lat. isthm. 4,4//; crass. 4,6//. 



With the preceding species. 

 Area: Madagascar. E. Africa (var.). 

 Botanisk Tidsskrift, 24. Bind. 12 



