BY G. I. PLAYFAIR. 107 



Coenob. diam. 74-96, membr. crass. 2-5, cell, (in arabitu circ. 

 16-28) diam. 4-6, inter se distant. 2-20, parthenogonidiis (8-12) 

 diam. 16-42 fi. 



Lismore (12, 16, 17). Common. 



This is the Volvox recorded by Bernard, Desm. et Protococc, 

 p. 165, as V. aureus Ehr. In all the specimens noted, I looked 

 very carefully for the connecting filaments, but without result. 

 Bernard also remarks. I.e., p. 166 : — " Je dois dire que, malgre 

 toutes mes recherches, malgre I'emploi des grossissements les plus 

 puissants et de reactifs varies, je n'ai pu arriver a les mettre en 

 evidence . . . . il n'y avait pas le moindre trait plus fortement 

 colore reunissant les cellules les unes aux autres, ni la moindre 

 trace quelconque pouvant faire croire a la presence de communi- 

 tions plasmiques." There are so few points in which one species 

 of Volvox can differ from another that the absence of these con- 

 nective filaments seems to me a decided specific character. 



A specimen was noted, in material that had been some time in 

 a bottle, with all the cells of one hemisphere developed into 

 oogonia. Cf. Overton, Gatt. Volvox, PI. iv,, f.28. 



Coenob. diam 210, membr. crass. 6; cell, (in ambitu circ. 14) 

 diam. 7-8, oogoniis diam. 15-18 /x. (PL ii., f.lO, 11). 



Genus Eudorina Ehr. 



EUDORINA ELEGANS Ehr. 



Chloroplasts granular, cells diam. 6, 10, 12, 16, 18, 22 //. 

 Lismore (12, 18). 



A family of 16 coenobia noted, coenobia 16-celled. Family 

 diam. 90, coenob. 25, cells 5-6 /x. 



Var. Wallichii Turner. 



Chloroplasts very pale green, translucent, with a single large 

 pyrenoid. Coenob. diam. 60, cell. 10 /x. 



Lismore (12). 



Cf. Turner, Alg. E. Ind., p.l55, T.xxi., f.lO; Chodat, Alg. 

 Vertes, p. 151, f.76A, b. A fine family of 16 coenobia seen, each 

 32-celled. Family diam. 350, coenob. 60, cell. 10 /w,. 



