BY G. I. PLAVFAIR. 839 



KiRCHN. LUNARis var. ACUTA, n.var. (PI. Ivii., £.33). 



Cellular lunatie; apicibus protractis acutissimis, longo intervallo 

 inter se distantibus. Cell. diam. S, alt. 7, crass. 3/x. 



Botanic Gardens (150). 



The apices of the cell, \\'liieli are wide apart, are drawn out to 

 a very acute point. 



Genus O o c Y s T I s Nag. 

 O. CRASSA var. Ostenpeldii Playf., forma. (PI. Iviii., f.l). 



C'hloroplastides S, pyrenoidibns instructse. Cell. long. 20, 

 lat. 13 fi. 



Lismore (285). 



Cf. ''Oocystis and Fremosphcera," p.l24, P1.7, f.l8, 19. This 

 variation generally has 2-4: chloroplasts; here we have it with 

 eight. 



Var. ELONGATA, n.var. (PI. Iviii., f.2, 3). 



Cellulje longe-ovales; apicibus acute-rotundatis; chloroplastidi- 

 bus 8. Cell. long. 25-27, lat. 15/x. 



Lismore (285, 286). 



The cells are more elliptic than in either the type or var. 

 Ostenfeldii; the apices more or less pointed, not incrassate or 

 apiculate. There is a parietal chloroplast, obviously fi-agmented 

 into eight parts, with pyrenoids. 



Var. GRANULOSA, n.var. (PI. Iviii., f.4). 



Cellulifi late elliptico-lanceolatje, lateribus tequaliter arcuatis, 

 apicibus acuminatis. Membrana ad apices introrsum incrassata. 

 Chloroplastides nullaj distinctaj, chlorophyllo difi'uso, cytoplasmate 

 granuloso. 



Cell. long. 27, lat. 1 ^fx. 



Lismore (298). 



The nearest to the type that I have noticed, the shape broadly 

 elliptic-lanceolate, with pointed, inwardly incrassate apices. 

 Thei-e are, however, no distinct chloroplasts, nor yet a parietaj 

 lamina; but the contents are granular, and the chlorophyll ap- 

 parently diffused. The nucleus was visible in the centre. 



