162 MESSRS. W. WEST AND G. S. WEST ON 
Long. 29-38°5 u; lat. 21-25 u; lat. apic. 11:5-17 mw; lat. isthm. 7:5-87 u; crass. 
16 u. 
Hab. Pond, Royal Botanical Gardens, Peradeniya. In artificial tank, and also in 
running water, in the Royal Botanical Gardens, Peradeniya. 
148. CosMARIUM GRANATUM, Bréb. in Ralfs, Brit. Desm. 1848, p. 96, t. 32. fig. 6. 
Hab. Paddyfields, Heneratgodha. In artificial tank, and also in running water, Royal 
Botanical Gardens, Peradeniya. 
149. COSMARIUM INZQUALIPELLICUM, West & GIS West, in Trans. Linn. Soc., Bot. 
ser. 2, v. 1895, p. 54, t. 6. figs. 28, 29. 
Hab. Paddyfields, Pandure and Heneratgodha. Paddyfield between Kosgoda and 
Urahaighasmahendai. 
150. CosMARIUM PACHYDERMUM, Lund. in Act. R. Soc. Scient. Upsala, ser. 3, 1871, 
p. 39, t. 2. fig. 15. 
Var. Minus, Nordst. in Act. Univers. Lund. ix. 1873, p. 18, t. 1. fig. 7. 
Long. 56-60 u; lat. 46-48 u ; lat. isthm. 17-19 u. 
Hab. In sluggish stream, Victoria Park, Colombo. Among Spirogyra sp. in fast- 
running stream, Peradeniya. Pond, Royal Botanical Gardens, Peradeniya. Pool in 
glen by roadside, near Bandarawella (altit. 4000-5000 ft.). In stagnant water of tank, 
Peradeniya. 
151. Cosmarium LUNDELLII, Delp. in Mem. Accad. Sci. Torino, ser. 2, xxx. 1878, 
p. 13, t. 7. figs. 62-64. C. subcirculare, W. B. Turn. in K. Sv. Vet.-Akad. Handl. 
xxv. no. 5, 1893, p. 52, t. De 3, and t. 9. figs. 27, 37. 
Var. CORRUPTUM, nob. C. corruptum, W. B. Turn. l. c. p. 51, t. 8. fig. 2. C. subeirculare, 
var. rugosum, W. B. Turn. l. c. p. 52, t. 8. fig. 7. C. rotundum, W. B. Turn. l. c. 
p. 98, t. 8. fig. 48. Var. minor, sinu non vel paullo aperto ; scrobiculis variabilibus, 
plerumque validioribus prope margines. 
Long. 51-59 u; lat. 48°5-57°5 u; lat. isthm. 23-37 y. 
Hab. Paddyfields, Heneratgodha. Distrib. Bengal ; Central India. 
The plants named by Turner C. corruptum, C. subcirculare, and C. rotundum are 
unquestionably forms of C. Lundellii, Delp. We have examined large numbers of 
C. Lundellii and its varieties from many parts of the world, and the nature of the sinus 
and the arrangement of the punctulations (or minute scrobiculations) on the cell-wall 
varies greatly. 
The var. corruptum, nob., differs from typical C. Lundellii only in being somewhat 
smaller, in the sinus being a little more closed, and in the minute scrobiculations 
generally appearing rather more distinct at the margins. Considering the wide dis- 
tribution and the immense variability of this plant, we see no character by which Indian 
forms of it can be separated as species. 
