NOTES ON THE CHROMATOLOGY OF ANTHEA CEREUS. 587 



The discrepancy in the measurements of the 2nd band of 

 Ulva and Anthea may be due to a trace of chlorofucin in 

 the bisulphide extract of the latter. The bands in the violet 

 may be neglected as they belong to the lipochrome constituents. 

 Hence it would appear that the chlorophyll constituent in 

 Anthea is closely related to, if not identical with, "yellow 

 chlorophyll.^^ A comparison of sp. 11 and 12 with sp. 15 and 

 16, teaches that there is a remarkable resemblance between 

 the pigments of Ulva and Anthea not only as regards the 

 chlorophyll bands in the red half of the spectrum, but also 

 as regards the lipochrome bands in the violet half. 



I have not here considered the identity of the chlorofucin 

 of Anthea with that found in Fucus serratus, as I have 

 done so already, but I may add that I have lately separated 

 chlorofucin by Sorby's method from other olive algse, such as 

 Fucus nodosus, and Laminaria digitata, and find that 

 the bands are identical with those of the chlorofucin of Anthea. 



We may now conclude that the pigments of Anthea are 

 the pigments of certain marine algae, and are there- 

 fore the pigments of the "yellow cells,'^ which are 

 known to be unicellular algse. 



With regard now to Krukenberg's results ; taking his first 

 paper^ and examining the plate attached to it, we find that in 

 the first spectrum he figures the double band in the red, the 

 second of which I have shown to belong to chlorofucin ; the 

 second spectrum represents the eftect of NaHO on "Anthea- 

 green," but it really represents the eftect of NaHO on 



^ ' Vergieichend. physiol. Studien.,' Ite Reihe, 5te Abtli., 1881. 



