80 O. A. MAG MUNN. 
Styela grossularia.—A brilliant carmine or lake-red 
colour surrounds the exhalent and inhalent orifices ; this is 
continued round the lining of the body-wall internally. The 
whole interior on section is bright orange. The brilliant red 
colouring matter transmitted red and a little green, while in a 
portion pressed out thin enough nearly the whole of the green 
was absorbed by a very broad band, probably formed by the 
coalescence of two bands. This appearance is best seen 
by direct sunlight. The orange pigment also strongly 
absorbed the violet rays, and in thinner parts showed a band 
at the blue end of green. The eggs were of a brilliant red 
colour; they transmitted the red rays, absorbing the violet 
strongly. 
It was impossible to separate the deep red- from the orange- 
coloured part, so they were extracted by solvents together. The 
ether solution was at first a fine red colour, but after standing 
for a couple of days it changed to a greenish-yellow tint, and 
although it did not show a red fluorescence it gave a band very 
like that of chlorophyll in the red, and one or two in the blue 
half of the spectrum. Seesp.16and17. On evaporating this 
solution at the temperature of the air it left a brownish residue, 
soluble in absolute alcohol, forming a dull yellow solution, and 
now this solution did not show a band in red. 
Evidently the chlorophylloid pigment had changed into some- 
thing else. To prove that the change was not due toa different 
solvent, the alcohol was evaporated and left a brownish residue 
which was re-dissolved in ether. The resulting yellow solution 
did not now show the band in red, although the second one of 
sp. 16 and that at F of 17 were visible. This would go to 
support what I said above, that there are reasons for 
supposing that a cholorophylloid pigment can be 
changed into a lipochrome sometimes. 
The residue from the last ether extract was brownish, and 
soluble in chloroform with a reddish colour ; this gave the band 
in green and another atits blue end. The residue became blue 
and green with nitric acid, dirty green with sulphuric acid, and 
was unchanged by iodine in iodide of potassium. The absolute 
