1907.] 



Fresh-water Algal Flora of Ceylon. 



199 



DESCRIPTION OF THE MAP. 



The Map shows the different localities mentioned in the present paper, the distribution 

 of rainfall, and the isothermal lines (after Trimen and Wright). The bracketed numbers 

 placed below the place-names are amount of rainfall in inches. The unbracketed numbers 

 show the position of the tanks, which are as follows : — 



1. Andankulam. 14. Kurunegalawewa. 



2. Balaluwewa. 15. Madakanawewa. 



3. Balankulam. 



4. Basawakkulam. 



5. Borlasgamawewa. 



6. Dambullawewa. 



7. Habaranewewa. 



8. Hiriwadunnewewa. 



9. Lake Kantelai. 



10. Karambewawewa. 



11. Kekunadurewewa. 



12. Kelawewa. 



13. Koilpuliumkulam. 



16. Madawachyawewa. 



17. Madokotaikulam. 



18. Mahakadawellawewa. 



19. Mahakekirawa. 



20. Malawewewa. 



21. Mancadawewa. 



22. Megaswewa. 



23. Lake Mineri. 



24. Nalandewewa. 



25. Namoluwewa. 



26. Neravieawewa. 



27. Nuwarawewa. 



28. Periyakulam. 



29. Punchikekirawa. 



30. Senadiniyagawawewa. 



31. Sigiri tank. 



32. Tibbotuwawewewa. 



33. Tirappanewewa. 



34. Tissawewa. 



35. Villamkulam. 



36. Walikulam. 



37. Wendrenkulam. 



38. Yaka-anaguhuwewa. 



39. Kannia Hot Springs. 



wet (e.g., Kalutara, Labugama), others (under the prevalent tropical con- 

 ditions) very dry (e.g., Hambantota, Vavoniya), whilst numerous intermediate 

 conditions between the two extremes are found (e.g., at Colombo, Matara, 

 etc.) ; the wettest place I visited was Labugama (166 inches). The amount 

 of rainfall at Peradeniya is not much less than at Colombo, but the lower 

 temperature, due to the higher altitude, has some influence on the algal 

 vegetation. In travelling upwards to Nuwara Eliya the gradual change of 

 temperature is very perceptible ; the climate in the uplands is indeed 

 practically European, although not so cold in winter, and considerably hotter 

 in the middle of a sunny day (mean annual temperature a little over 60° F.). 

 The rainfall, however, is heavy (about 90 inches), and that produces an 

 abundant vegetation. If we further bear in mind that there is a coastal and 

 an inland region, we shall have roughly reviewed the diversity of climatic 

 conditions obtaining in the island.*" 



Since my stay in the island was of brief duration (August 21 to November 

 10, 1903) my account of the algal vegetation is necessarily very incomplete 



* My travels in Ceylon may be subdivided into three distinct tours : (i) Along the 

 western and southern coasts as far as Hambantota, the time being devoted to a study of 

 the algal flora and Phytoplankton of the lagoons and estuaries at Negombo, Panadure, 

 Kalutara, Ambalangodda, Bentotta, and Matara, and to an investigation of the subaerial 

 Algse ; (ii) Into the northern plains as far as Yavoniya and Trincomalie, where I was 

 mainly occupied with a study of the Algse found in the inland fresh-waters (especially the 

 numerous tanks or irrigation-reservoirs) ; (iii) A brief visit to the uplands round about 

 Nuwara Eliya, which proved particularly interesting in comparison with the observations 

 made in the lowlands. In addition to that, I stayed intermittently at Peradeniya for 

 about a fortnight. 



