THE FRESHWATER ALG OF CEYLON. 207 
Genus VANHEURCKIA, Bréb. 
360. VANHEURCKIA RHOMBOIDES, Bréb. Ess. Monogr. Vanh. p. 4, t. 3. fig. 15. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
Var. SAXONICA, West & G. S. West. 
Hab. Paddyfields, Heneratgodha. Stream, Victoria Park, Colombo.  Paddyfields, 
Pandure. 
Genus PLEevROsIGMA, W. Sm. 
361. PLEUROSIGMA ACUMINATUM, Grun. in Abh. Zool.-bot. Ges. Wien, x. 1860, p. 561, 
t. 4. fig. 6. 
Hab. Small pond, Peradeniya. 
362. PLEUROSIGMA SPENCERII, W. Sm. in Ann. & Mag. Nat. Hist. ser. IL. ix. 1852, 
p. 12, t. 2. fig. 15. 
-Hab. Shallow pool, mangrove-swamp, Pandure. 
Family GOMPHONEME.E. 
Genus GOMPHONEMA, Agh. 
363. GOMPHONEMA TENELLUM, W. Sm. Brit. Diat. i. p. 80, t. 29. 
Hab. Among Spirogyra sp., from fast-running stream, Peradeniya. 
364. GowPHONEMA GRACILE, Ehrenb. Infus. 1838, p. 217, t. 18. fig. 3. 
Hab. Pond, Victoria Park, Colombo. Pond, Royal Botanical Gardens, Peradeniya. 
In artificial tank and in running water, Peradeniya. 
Family ACHNANTHEJE. 
Genus ACHNANTHES, Bory. 
365. ACHNANTHES LINEARIS, Grun. in Cleve & Grun. Arct. Diat. p. 23. 
Hab. Pond, Royal Botanical Gardens, Peradeniya. 
Genus CoccoxEis, Ehrenb. 
366. CoccoxErs PLACENTULA, Ehrenb. Infus. p. 194. 
Hab. Pond in glen by roadside, near Bandarawella (altit. 4000-5000 ft.). 
