208 



FRESH-WATER ALGM FROM BURMA. 



inferioribus subrotundatis, lateribus subrectis (vel levissime convexis), angulis superioribus 

 late rotundatis, apice levissime convexo, cum granulo uno ad angulum inferiorem et 

 granulis parvis duobus intra angulum, aerie granulorum magnorum 5 intra et juxta 

 apicem et granuio uno ad angulum superiorem unumquemque, verrucis rotundatis 3 trans 

 centrum semicellularum ; a vertice visse late ellipticse verrucis rotundatis 3 ad medium 

 utrobique, granulis parvis 3 ad polos, et serie granulorum 7 intra marginem lateralem 

 unumquemque; a latere visse subcirculares, verruca rotundata magna ad medium lateris 

 uniuscuj usque et granulo magno juxta apicem utrobique. 



Long. 31*; lat. 22*5^; lat. istbm. 6ft; crass. 17/*. 

 Jlab. — Mansang, near Hsipaw (No. 24193). 



This species bears some resemblance to C. scitum W. & G. S. West (Alg. Madag. 1895, p. 7, 

 f. 29), but is distinguished by its oblong -rectangular semicells and by the three large rounded warts 

 in the centre of each semicelL The vertical view has more obtuse poles, and the apical series of 

 large granules projects slightly above the apex in the front view. 



From C. Wellheimii Schmidle (Ost-Africa Desmid. 1898, p. 38, t. 2, f. 25) it differs in the 

 from of the semicells, in its constriction, in the disposition of the apical granules, and in the 

 absence of any granules above the isthmus. 



It might also be compared with C. cyathiforme W. & Gr. S. West (Some N, Amer. Desm. 1896, 

 p. 248, t 15, f. 9). 



111. COSMARIUM BURKILLII 8p. II. (PI. XIV, fig. 13). 



C. subniediocre, psene l|-plo longius quam latum, profundissime constrictum, 

 einu angusto-lineari extremo subampliato ; semicellulae subrectangulares, angulis basalibus 

 levissime rotundatis, lateribus paraJlelis, angulis superioribus rotundo-truncatis, apice 

 truncato et subrecto, cum granule smgulo ad angulum basalem et granulis paucis 

 (arc. 6) ad et intra margines laterales, cum dente obtuso ad angulum superiorem 

 unumquemque prope apicem et granulis magnis binis infra dentem, in centro semi- 

 cellularum granulis magnis circiter 14 in seriebus obliquis et verticalibus ordinatis et 

 scrobiculis minutis inter. granulos; a latere visse subcirculares; a vertice visa* elliptical, 

 granulis 5 ad medium utrobique, polis trigranulatis, cum granulis intra regionem polarem 

 et juxta medium marginum lateralum ; membrana punctata. 



Long. 47\> ; lat. 34^ ; lat. isthm. 10^ ; crass. 21a. * 



Bab.— Mansang, near Hsipaw (No. 24193). 



This species should he compared with C. Freemanii W. & G. S. West. 



Var. bectangulabe var. n. (PI. xiv, fig. 14). 



Var. minor, angulis superioribus semicellularum minus rotundatis et granulis 

 dentatis 8 instructis, granulis centralibus magnis propius ad apicem. 



Long. 37-5— 38-5/*; lat. 25-5-27* ; lat. isthm. 8/*; crass. 20-5*. 

 ifa£.— With the typical form, but more abundant (No. 24193). 



112. Cosmabium Blyttii Wille, Norges Ferskv. Alg. 1880, p. 25, t, 1, f. 7. 



ift ^*7 In * pring8 ° n the river bank > Bhamo (No. 21501). Momauk, east of 

 Bhamo (No. 2lo51). 







