90 ON THE FKESHWATEE ALG^ OF MADAGASCAE. 



Fig. 10, 11. Staurastrum volans, n. sp. 520/1. 



13,13. „ leptocladum, '^ordst., xar. cornutum,W\\\e. 520/1. 



14). Euastrum hinale, Ralfs. 520/1. 

 15, 16. ,, deniiculatum, F. Gay, forms. 520/1. 



17. J, amatum, Ilalfs. 520/1. 



18. „ „ var. /iy,rifi?G/Mm, Delp., forma. 520/1. 



19. Spondylosium papillosum, n. ST^. 520/1. 



20. Closterium lagoense, Nordst., var. IcEve, n. var. 520/1. 



21. „ lanceolatum, Kiitz. 120/1. 



22. Cosmarium pseudoprotuherans , Kirchn., var. angustius, Nordst, 520/1, 



23. „ concinnum, Reinsch. 520/1. 



34. ,, Regnesii, Reinsch, var. tritum, West. 830/1. 



25. „ c/^ip.9oirfewm, Elfv., forma wmor, Anders. 520/1. 



26. „ //MojoAorMm, Nordst., forma. 520/1. 



27. „ viride, Josh. 520/1. 

 28,29. „ sulcatum, 'Nordst. 520/1. 



30. ., monilifot^me, Ralfs. 520/1. 



31. „ „ var. punctatum, h&gerh. 520/1, 

 32, 33. Arthrodesmus subulatus, Kiitz,, forma, 520/1, 



34. Desmidium Swartzii, Ag,, var. quadrangulatum,, Roy. 520/1, 



35. „ „ var. amblyodon, Rabenh. 520/1, 



36. „ Baileyi, De Bary, a. genuina, Nordst. 520/1. 



37. Tetrapedia glaucescens , Boldt. 520/1. 



38. Scenedesmns bijugaius, Kiitz. 520/1. 

 39, 40. Pediastrum tetras, Ralfs. 520/1. 



41, 42. „ duplex, Meyen, var. clathratum, A. Br. 520/1 . 



Note to p. 41. — Since this paper was presented to the Society, we have received information from 

 the Rev. R. Baron as to the localities. No. was from the neighbourhood of Antananarivo • the 

 remainder, with the exception of No. 36, mentioned on p. 41, were collected in the immediate vicinity of 

 Lake Alastra. 



Notes ^opp. 59, 60. — Since the description of Cosmarium Pseudoregnesii (n. 80) was drawn up, a paper 

 by Eichler and Gutwinski has appeared — ' De nonnullis spec. Algar. nov.,'' Krakow, 1894 j in this is 

 figured and described (p. 170, t. 5. f. 27) a new variety {va.r. polonicum) of C. Nova-Semlia, This is 

 evidently the same as that we have described, and in our opinion not closely related to C. Novee-Semlice. 

 As there is already a C. polonicum, Racib., our name must stand. 



Cosmarium later e-undatum, Roy, MSS. sub n. 81. Recently Messrs. Roy and Bissett's 'Scottish 

 Desmids' has appeared, but latere-undatum has been changed to garrolense, Roy & Bissett (Scottish 

 Desm. p. 34, t. 2. f, 4), 



