CONTRIBUTIONS TO ANIMAL CHROMATOLOGY. 87 
is precipitated out in “ insignificant” red or yellow-brown 
flocks, and cannot be regenerated. Caustic soda and ammonia 
colour the solution an amethyst colour. For other characters 
the original must be consulted. ‘‘ Asterocyanein,” referred to 
above, is related to this according to Krukenberg. 
Corynactis viridis.—Some specimens of this little sea 
anemone are red, not the beautiful green from which the 
species takes its name. On putting one of these red specimens 
into a compressorium and examining it by means of an achro- 
matic condenser and microspectroscope, the spectrum seen is 
represented in sp. 18. On comparing this with the various 
spectra I have described in sea anemones,! it will be found that 
the bands do not correspond either with those of actiniohematin 
or actiniochrome. They are nearer the violet and differ in 
other respects, and yet they belong to a colouring matter 
which must be related to the former, since the pigments can 
evidently be changed into one which gives bands like those of 
hemochromogen (sp. 19). If the Corynactis is put into a 
solution of caustic potash these bands disappear, but on very 
careful examination we find that some new bands have appeared ; 
these are like those of sp. 19, except that the first one is 
narrower than the first in that spectrum and slightly nearer 
the red, and the second fainter than the second of sp. 19. It 
is quite evident that here a respiratory pigment is present, 
and it corresponds very closely to actiniohematin, since on 
dipping the portions treated with caustic potash into ammo- 
nium sulphide we get sp. 19, closely resembling that of 
reduced hematin. The most noticeable thing about the spec- 
trum of the green specimens was the presence of a band at 
the blue end of green with its darkest part from about A 507 to 
A481. I could find no “ yellow cells” in this species. 
Tubularia indivisa.—The red polyp heads of this species 
were examined. The colouring matter in its natural situation 
is pink, although in some lights it appeared violet brown ; it 
seemed to absorb the violet end of the spectrum, and gave 
1 “Qbservations on the Chromatology of Actiniz,” ‘ Philos. Trans.,’ part 
ii, 1885. 
