Sv. Vet.-Akad. Handl. Bd. 24, no. 5, 1893, p. 60, t. VIII, f. 65, t. IX, f. 2. 

 C. palustre var. ovale Turn. 1. c. 



a. Typical forms of the usual size of this species in the tropics. 

 Long 60 — 64/;; lat. 69 — 75/,; lat. isthm. 30—31//. 



These specimens were exactly like those from Ceylon and Singapore, 

 and all possessed the large conical pore which passes through the thickening 

 at the basal angles of the semicells. Turner, who misinterpreted the 

 nature of this pore, figured it as a spine at the angle, and thus created 

 a new name 9 C. palustre" for typical specimens of the large form of 

 C. obsoletum so abundant in tropical Asia. 



b. Smaller forms without the conical pore at the basal angles. 

 Long. 34/^; lat. 44 fi ; lat. isthm. 15,5 — 18//; crass. 23 ji. 



The above two forms show a marked difference in size and corres- 

 pond to the two forms mentioned by Lütkemüller from Central China 

 (Cfr. Ann. des k. k. Naturhist. Hofmus. Wien, 1900, Bd. XV, Heft 2, 

 p. 119). 



Abundant in stagnant water in the jungle. 



Area: Europe, N. and S. America, India, Ceylon, Burmah, Central China, 

 E. Indies, New Zealand and Australia. 



60. C. subauriculatuiii West & G. S. West in Trans. Linn. Soc. bot. 

 ser. 2, V, 1895, p. 55, t. VI, f. 31. 



Long. 46 /i ; lat. sine spinul. 48//, cum spinul. 52 // ; lat. isthm. 21// ; 

 crass. 29 //. (Tab. nostr. II, fig. 19.) 



In stagnant water among other Desmids. 

 Area: Madagascar, Central China. 



Var. triiucatum West & G. S. West, n. var. (Tab. nostr. II, fig. 20.) 

 Var. angulis truncatis, spinis binis reductis ornatis; a vertice visis ut 

 in forma typica. 



Long. 41//; lat. 46//; lat. isthm. 18//; crass. 24//. 

 Compare with the front view of C. erosum Delp. 

 In stagnant water in the jungle. 



61. C. Schmidtii West & G. S. West, n. sp. (Tab. nostr. Ill, fig. 27 

 -28.) 



G. parvum, paullo longius quam latum, modice constrictum, 

 sinu breviter lineari extrorsum aperto; semicellulæ elliptico-semi- 

 circulares (cellulæ subcirculares), isthmo lato; a vertice visæ ellip- 

 ticæ; a latere visæ subcirculares; membrana delicatissime et dense 

 punctulata, pyrenoidibus singulis. 



Long. 22— 23u; lat. 18-20^; lat. isthm. 8,5—9,5/./; crass. 11,5 

 -12,5/,. 



After much consideration we have come to the conclusion that this 

 must be described as a distinct species. The shape of the semicells and 

 the wide isthmus are characteristic. Perhaps the nearest species are C. 

 melanosporum Arch, and C. nitidulum De Not., but from both these 

 species it is easily distinguished. 



