CONTRIBUTIONS TO ANIMAL. CHROMATOLOGY. 55 
chromate”’ was simply due to the fact that it had to penetrate 
to the food contained in the stomach, and then to gradually 
dissolve it out. The chlorophyll is not due to a “ liver ” here ; 
in other words, it is not an enterochlorophyll, but, as I said 
before, a food product. 
The Antedonin of Antedon (macronema ?),—I 
here take the opportunity of thanking Professor F. Jeffrey 
Bell for his kindness in sending me solutions of various 
colouring matters, and among the rest for a solution in spirit 
of the above. Professor Moseley ! was the first who described 
and named antedonin. He states in the paper referred to in 
the footnote, that various species of Antedon appear to be 
usually either of a rose colour, or of an orange or yellow, 
running into a yellow brown, or of a dark purple. Both the 
rose or red and yellow colouring matters are freely soluble in 
alcohol and usually in fresh water. The coloured solutions 
obtained from a large number of such specimens dredged by 
the “Challenger ” were examined, but none of them yielded 
a characteristic absorption spectrum showing bands. The 
European species also containa colouring matter freefrom bands. 
In Antedon rosacea all the spectrum except red seemed to 
be absorbed. Professor Moseley found a species occurring at 
Suez which yielded a similar spectrum. By dredging in from 
eight to twelve fathoms in the Channel between Somerset and 
Albany Island, at Cape York, Australia, an Antedon was 
obtained in abundance which was of a dark purple colour. 
The colouring matter was insoluble in glycerine, to a large 
extent in fresh water, and abundantly in weak spirit, and gave 
an intense fuchsin-coloured solution. This, when compared 
with that obtained from a deep-sea Holothurian found to 
contain the same colouring matter, was seen to be much redder, 
but it became pinker when diluted with alcohol, and at last 
quite pink and indistinguishable by the naked eye from that of 
the Holothurian. 
The solution when of moderate strength gives, Moseley states, 
1 “On the Colouring Matters of Various Animals, &.,” ‘Quart. Journ. 
Micr. Sci.,’ vol. xvii, 1877. 
