CONTRIBUTIONS TO ANIMAL CHROMATOLOGY. 69 
\ 462 to 1441 (?). This pigment was also soluble in turpen- 
tine, olive oil, &c., and became a brilliant deep blue, fading to 
greenish blue with nitric acid, a deep indigo blue with sul- 
phuric acid, and a dark green and greyish green with iodine 
in iodide of potassium. 
Acetic acid extracted some of the red pigment from the 
integument the solution being at first red, but soon changing 
to dark yellow, and showing in a deep layer strong absorption of 
the violet end. Glycerine failed to extract any colouring matter. 
The principal pigment here is a red lipochrome, differing from 
rhodophan, in the presence of two bands. It resembles the 
“orangin” which Krukenberg! got from Astropecten 
aurantiacus, which he says is a “chlorophan-like pigment” 
and which he found accompanied by another, a rhodophan. 
Enterochlorophyl! is also present in Goniaster. 
Cribella oculata.—The integument of this species contains 
a similar lipochrome to the last, and it also is free from 
hematoporphyrin. ‘The orange-coloured chloroform extract 
of the pigment shows two absorption bands, of which the 
first was darker than the second, and these bands were not 
exactly in the same position as in Goniaster, being some- 
what farther apart. 
The red ovaries also contain a similar lipochrome. 
Solaster papposa. The brilliant red of this species is also 
due to a similar lipochrome, and no hematoporphyrin occurs in 
the integument. Although at first sight the bright red pigment 
might be taken for a rhodophan, yet in thin layers of the 
alcohol, ether, chloroform, and bisulphide extracts, there 
are two bands instead of one, showing the presence of a 
chlorophan-like pigment. Here also the radial ceca yield 
enterochlorophyll united to a lipochrome, and it is highly 
probable that the latter is built up, as well as the former, in 
that situation. I have noticed occasionally that some solutions 
of enterochlorophyll from starfishes showed only one or two 
chlorophyll bands, which after some time, or more quickly by 
heating, disappeared, and then the pigment present seemed 
Tes Vergl. physiol. Studien,’ zweite Reihe, dritte Abth., 1882, S. 62. 
