THE FRESHWATER ALG OF CEYLON. 209 
Genus ACTINELLA, Lewis. 
377. ACTINELLA PUNCTATA, Lewis, in Proc. Acad. Philad. 1863 (1864), p.943. Gonato- 
zygon sexspiniferum, W. B. Turner. 
Hab. Pond, Royal Botanical Gardens, Peradeniya. 
Exactly like specimens we have examined from Malaga, New Jersey, U.S.A. 
Genus DrswocoNiUM, Ehrenb. 
378. DESMOGONIUM RABENHORSTIANUM, Grun. Diat. Ins. Bangka, p. 6, t. 1. fig. 1. 
Hab. Paddyfields, Heneratgodha. 
This was abundant, and precisely like numerous specimens we have examined from 
Dominica, W. Indies. 
Family SYNEDREZ. 
Genus SYNEDRA, Ehrenb. 
379. SYNEDRA PULCHELLA, Kuetz. Bacill. p. 68, t. 29. fig. 37. 
Hab. Among Spirogyra sp. in fast-running stream, Peradeniya. Pool in glen by 
roadside, near Bandarawella (altit. 4000-5000 ft.). 
380. SYNEDRA Urea, Ehrenb. Infus. p. 211, t. 17. fig. 1. 
Hab. Pond, Victoria Park, Colombo. Paddyfield between Kosgoda and Urahaighas- 
mahendai. Among Spirogyra sp. in little muddy backwaters, Mahawelli Ganga. Pond, 
Royal Botanical Gardens, Peradeniya. 
Var. SUBHQUALIS, Van Heurck, Syn. p. 151, t. 38. fig. 13. 
Hab. Mahawelli Ganga. 
381. SYNEDRA Acus, Kuetz. Bacill. p. 68, t. 15. fig. 7. 
Hab. In running water, Royal Botanical Gardens, Peradeniya. 
389. SYNEDRA RADIANS, Kuetz. l. c. p. 54, t. 14. fig. vir. 1-4. 
Hab. In artificial tank, Peradeniya. 
Family FRAGILARIE. 
Genus FRAGILARIA, Lyngb. 
983. FRAGILARIA VIRESCENS, Ralfs, in Ann. & Mag. Nat. Hist. ser. I. xii. (1843) p. 110, 
t. 2. fig. 6. 
Hab. On wet rocks, Mahawelli Ganga. 
384. FRAGILARIA CAPUCINA, Desmaz. ex Kuetz. Bacill. p. 45, t. 16. fig. 3. 
Hab. Among Podostemons, Mahawelli Ganga. 
