— 172 — 
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—64y; lat. 69—75y; lat. isthm. 30—31 p. ; 
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 ,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. 44y; lat. isthm. 15,5—18 yw; crass. 23 ps. 
The above two forms show a marked difference in size and corres- 
pond to the two forms mentioned by Liitkemiiller 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.subanriculatum West & G.S. West in Trans. Linn. Soc. bot. 
ser. 2, V, 1895, p. 55, t. VI, f. 31. 
Long. 46 2; lat. sine spinul. 48 #, cum spinul. 52 p; lat. isthm. 21 4; 
crass. 29. (Tab. nostr. II, fig. 19.) 
_ In stagnant water among other Desmids. 
Area: Madagascar, Central China. 
Var. truancatum West & G. S. West, n. var. (Tab. nostr. UJ, fig. 20.) 
Var. angulis truncatis, spinis binis reductis ornatis; a vertice visis ut 
in forma typica. : 
Long. 41; Jat. 46 4; lat. isthm. 18 4; crass. 24. 
Compare with the front view of C. eroswm Delp. 
In stagnant water in the jungle. 
61. (. Schmidtii West & G.S. West, n. sp. (Tab. nostr. Ill, fig. 27 
— 28.) 
C. parvum, paullo longius quam latum, modice constrictum, 
sinu breviter lineari extrorsum aperto; semicellulee elliptico-semi- 
circulares (cellule subcirculares), isthmo lato; a vertice vise ellip- 
ticee; a latere visee subcirculares; membrana delicatissime et dense 
punctulata, pyrenoidibus singulis. 
ee 22—23 w; lat. 18—20 yp; lat. isthm. 8,5—9,5 2; crass. 11,5 
— 1a,o fs 
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. nitiduliim De Not., but from both ‘these 
species it is easily distinguished. 
