EXPLANATION OF THE PLATES. 329 



PLATE II. 

 Figs'. 1 14. Palmoglcea macrococca. 



(Continued from PL. J.) 



Fig. 1. Two cells, laterally connected, pushed aside 

 in opposite directions. 



Figs. 2 4. Conjugated cells, in which the end of one 

 is attached to the side of the other. 



Fig. 5. Conjugation carried further, by the widening 

 of the connecting piece. (The cells from fig. 21, pi. 1, to 

 this figure, already exhibit evident drops of oil in the 

 interior.) 



Figs. 6 9. Transitional forms produced by still fur- 

 ther advanced conjugation, but still two-lobed ; they 

 often persist in this form. 



Figs. 10 12. Seed-cells formed by complete union 

 of two conjugated cells. These, as also those represented 

 in 69, are almost filled with large drops of oil, and 

 have a thicker coat than before the conjugation. 



Fig. 13. Seems to be an union of three cells, which I 

 only met with once. 



Fig. 14. A group of four cells, enclosed by a tough 

 coat, probably produced by the division of the contents 

 of a seed-cell. 



Figs. 15 22. Schizochlamys gelatinosa, A. Br. 



This forms a gelatinous coating over water-plants, as 

 also swimming masses, on the peat-moors of the Black 

 Forest. (See pp. 181, 230, in the text.) Magnified 600 

 diameters. 



Figs. 15 16. Two cells which throw off their cell- 

 membrane by regular splitting into two halves, without 

 themselves dividing. 



Fig. 17. A cell which, after throwing off its earlier 



