6Y G. I. PLAY FAIR. 523 



angulis inferioiibus obtusis. Pyrenoides parvse 2, pauUo supra 

 cellulam mediam ad latera disposit?e. 



Long. 20, lat. 16, crass. <'^: corp. lat. 11//. Lismore (344). 



The eavelope is quadrate with convex base, straight parallel 

 sides, fiat apex, and the upper angles obliquely truncate. A 

 specimen was noted w ith two small pyrenoids, on either side one, 

 a little above the centre ot" the cell. No stigma present. For 

 another example of a pyrenoid on each side, see Chi. longistigma 

 Dill, (Wille, I.e., T.iv., f.21). 



Genus Phacotus Perty. 

 Phacotus crassus, n.sp. (PI. Ivi., f.7, 8). 



Cellulae fronte visse fere circulat?e, margine aspera, ad apicem 

 papilla instructse; a latere paullulo compressa;, oblongae, lateribus 

 arcuatis, apicibus late-rotundatis, papilla instructis. Membrana 

 crassa, aspera. Cytoplasma in globo retractum, densum, crasse 

 granulosum ; vacuolis contractilibus 2 ; stigmate nullo nee 

 pyrenoidi. 



Long. 22, lat. 19, crass. 14/x. Lismore (311). 



Nearly circular in face-view, with apical papilla; oblong some- 

 what compressed from the side, with broadly rounded ends and 

 arched sides. The membrane is thick, and rough with irregular 

 asperities. The cytoplasm is retracted into a globe beneath the 

 apex, contents dense, coarsely granular, two contractile vacuoles 

 noted but no stigma or pyrenoid. 



Phacotus glaber, n.sp. (PL Ivi., f.9, 10). 



Cellulai fronte visse fere circulate, ad apicem concavie, papilla 

 instructse; a latere modice ovato-oblongse, ad apicem truncatse, a 

 tergo fere hemisphiiericse, lateribus levissime arcuatis. Membrana 

 crassa, glabra, dilute rufescens. Cytoplasma in globulo parvo ad 

 apicem retractum; stigmate nullo nee pyrenoidi. 



Long. 22, lat. 21; cytopl. glob. diam. 9^/x. Lismore (312). 



In face-view, nearly circular with a slight concavity, and a 

 papilla at the apex; ovate-oblong from the side, sides slightly 

 arched, apex truncate, hemispherical behind. Membrane smooth, 



