— 173 — 
In large numbers amongst C. leve Rabenh. on rocks in a riverbed, and 
also in stagnant water amongst various species of Spirogyra. 
62. C. subtriordinatum West & G. S. West in Journ. Bot. April 1897, 
p. 122, t. 368, f. 11. 
Forma. (Tab. nostr. II, fig. 18.) 
Long. 22--24 »; lat. 21 2; lat. isthm. 6—6,5 4; crass. 12,5—13,5 p. 
These forms only differ from the African examples in the somewhat 
simplified central granules. They are distinguished from C. subpunctula- 
tum Nordst. by their smaller size, much fewer and more acute granules, 
and by the different arrangement of the central granules. 
In stagnant water in the jungle. 
Area: W. Africa. 
63. €. pseudotaxichondrum Nordst. in Ofvers. af K. Vet.-Akad. Férh. 
1877, no. 3, p. 20, t. Il, f. 5. 
Var. siamense West & G.S. West, n. var. (Tab. nustr. III, fig. 26). 
Var. sinu apertiori, semicellulis minus angularibus, marginibus 
lateralibus leviter undulatis, cum serie granulorum magnorum 3 
trans medium semicellule uniuscujusque. 
Long. 26; lat. 292; lat. isthm..6,5 4; crass. 17 p. 
This variety is nearest to C. pseudotaxichondrum var. africanum 
West & G.S. West (in Journ. Bot. May 1897, p. 1738, t. 367, f. 14). 
In stagnant water in the jungle. 
Area: This species (with its varieties) 1s widely distributed in tropical and 
subtropical regions. 
64. (. quadrifarium Lund in Nova Acta Soc. Scient. Upsala, ser. 3, 
VIII, p. 32, t. II, fig. 12. 
Forma hexasticha Nordst. in Kongl. Sv. Vet.-Akad. Handl. Bd. 22, 
no. 8, p.49; C. hexastichum Lund. |.c. p. 33, t. I, f. 13. 
Long. 53; lat. 41 w; lat. isthm. 174; crass. 29 p. 
In stagnant water in riverbed. 
Area of type: Europe, N. America, Ceylon. 
65. (€. subdecoratum West & G. S. West in Journ. Linn. Soc. bot. 
XXXII, 1897, p. 164, t. VII, f. 13. 
Long. 76 4; lat. 54—59 4; lat. isthm. 19—22 p. 
In stagnant water in the jungle. 
Area: Ceylon and Singapore. 
66. €. pseudorthopunctatum West & G.S. West, n.sp. (Tab. nostr. 
Il, fig. 12—13.) 
C. parvum, circiter tam longum quam latum, profunde con- 
strictum sinu aperto et acutangulo; semicellule subelliptice, ventre 
valde convexee, dorso valde convexee in medio subrecte, angulis 
