BY G. I. PLAYFAIR. 515 



arrangement of the chloroplasts could not be discerned; a distinct 

 stigma near the apex was noted, but no pyrenoid. 



Var. ANGULATA, n.var. (PI. Iv., f.3). 



Forma ad apicem depressa, in medio depressione papilla in- 

 structa; lateribus inferne paullo angulatis; ceteris ut in forma 

 typica. 



Long. 17, lat. 23/jt, Lismore. Cum pi-iori. 



A cup-shaped depression with central papilla replaces the 

 pointed apex of the type. The sides run back to a slight angle 

 in the hinder portion. 



Var. IN.EQUALIS, n.var. (PI. Iv., f.4). 



Forma major, ovata, in fronte acuminata, a tergo late-rotund- 

 ata. Membrana luteo-fuscescens: ceteris ut in forma typica. 



Long. 30, lat. 21-25J/X. Lismore. Cum priori. 



In all specimens of this form there was a minute projection at 

 one side of the apex. Undoubtedly, I think, this variation is 

 produced by uneven growth, only one lobe of the cell-wall devel- 

 oping; the small subapical projection is the remains of the un- 

 developed lobe. 



Carteria multifilis (Fresen.) Dill. (PL Iv., f.5, 6). 



Cellulse parviB sph^ericse; membrana tenuissima vel interdum 

 crassa; papilla nulla nee cytoplasmatis projectione; chloroplastide 

 crasso parietali; pyrenoidi in media cellula. 



Diam. cell. 8-11; pyrenoid. 3/^. Lismore (345). 



Cf. Fresenius, Beitr. z. Kenntn. mikrosk. Organism., Abh. d. 

 Senckenb. Gesells., 1856, p.235. Goroshankin, Morph. u. System, 

 d. Chlamyd., ii., 1891, p. 120, reproduces Fresenius' original de- 

 scription of the type, the chief points of which are: — cell spher- 

 ical or oval, length 10-16/x, pyrenoid in the centre of the cell, 

 cytoplasm minutely granular, stigma between the apex and the 

 middle, membrane very delicate, close-fitting. 



I have not seen Fresenius' figure of the type, but our specimens 

 seem to me in some respects to tally with his description better 

 than other published figures, and specially in this, that they have 



