BY G. I. PLAYFAIR. 827 



Lismore (263). (PI. Ivi., f.l5). 



Plentiful in gathering No 263. The cell is slightly but dis- 

 tinctly flattened in front, the membrane incrassate; and there is 

 a narrow, linear aperture in the chloroplast just above the 

 pyrenoid. 



Chlamyd. monadina var. ovalis, n.var. 



Cellulaj exacte ovales. Long. 22-24, lat. 17-20; pyren. long. 10, 

 lat. 2/x. 



Lismore (263). (PI. Ivi., f.l6). 



Instead of the spherical shape of the type, this form is a 

 perfect oval. The pyrenoid, as usual, is strap-shaped, and 10 x 2/x 

 in dimensions. 



Chlamydomonas globosa Snow. (PI. Ivi., f. 17). 



Cell. diam. 8-12/ji. Auburn; Lismore (263). 



Cf. Julia W. Snow, Plankt. of L. Erie, Bull. U. S. Fish. 

 Comm., 1902. The specimens from Lake Erie were 5-8/x in 

 diameter. In ours, the chloroplasts were not fully formed, being 

 gathered towards the hinder part of the cell. Stigma distinct. 



Chlamydomonas Lismorensis, n.sp. (PI. Ivi., f. 18). 



Cellulse minutae, oblonga?; lateribus levissime arcuatis piene 

 pai'allelis; apicibus rotundatis; stigmate bacilliformi. 



Cell. long. 8-lOi, lat. 3-5/x. 



Auburn; Lismore (263, 299). 



In the warm waters of tropical and subtropical countries, there 

 is a tendency for flagellates to become motile at a very early 

 stage of their development. This is a very small form, oblong, 

 almost cylindrical with rounded ends ; the usual bell-shaped 

 chloroplast very shallow behind, no pyrenoid, as a rule. 



Var. OVATA, n.var. (PL Ivi., f.l9, 20). 

 Cellulai elongata?, ovataj, postice late-rotundatte, fronte attenu- 

 ate; apicibus acuminatis. Cell. long. 10, lat. 3-5/i,. 

 Lismore (298). 

 Elongate elliptical-ovate in shape, broadly rounded behind, 



