BY G. I. PLAYFAIR. 341 



and in no case were there more than 5. Male, female, and 

 vegetative coenobia were observed. The oospores correspond 

 exactly to the description given for V. aureus by Overton, Gatt. 

 Volvox, p. 33, {V. minor), and by Janet, Le Volvox, p.99. They 

 are smooth, with a thick outer and thin inner membrane, and 

 (apparently) a mucilaginous packing between the two. The 

 membrane is first hyaline, then yellow, orange, and finally red- 

 brown (PI. xliv., f.4). 



Var. GUTTULOSA, n.var. (PI xliv., f.l.) 



Cellulae subpyriformes, postice subglobosse, fronte in rostro 

 angusto acuto productse; stigmate rubro in extreme rostro posito; 

 cytoplasmate granuloso, chloroplastibus etiam; i3yrenoidibus 

 nullis, graiiiilis autem paucis magnis. 



Cell. long. max. 16, rostra, ca. 6; cell. lat. max. 6, ap. 1| /x. 

 Cell, inter se distant. 12 /x. Coen. integum. crass. 6/x. 



Lismore (250). 



A very rare form, interesting, however, as showing how the 

 cells may vary in shape. 



Var. TESSELLATA, n.var. 

 Cellulse a vertice visse dense congregatse, inter sedistantes 1-2 /x, 

 interdum fere contigu?e, ambitu ineequaliter orbiculata3, subpoly- 

 goniae, dimensionibus variis. 



1. Coin, matric. diam. 475-600; cell. diam. 2-6 vulgo 4 /x. (PI. 

 xliv., f 2.) 



Lismore (242). 



2. Ccen. filial, diam. 180; cell. diam. circ. 3/x. (PL xliv., f.3,) 

 Lismore (242), 



This form is found both in the free mother-ca3nobia and in 

 daughter-coenobia; in the latter case, the mother-coenobium very 

 often conforms to the type. The variation was plentiful in No. 

 242, a gathering taken out of roadside rainwater-pools on June 

 2nd, 1914, (winter) after heavy rains, 



VoLVOx GLOBATOR (Linn.) Elir. (PL xliv., f.5, 6.) 

 Coen. diam. 450-600; integum. crass. 1-8; cell. diam. 4-6, vel 6-8, 

 fills connect, crass, ca. 1 /x, inter se distant. 2-3 /x. Zvgota?, 



