CONTRIBUTIONS TO ANIMAL CHROMATOLOGY. 75 
which it formed a dark brown-green solution which gave no 
bands. 
The intestine is covered with an orange-coloured glandular 
tissue, which shows a band at the blue end of green, owing its 
colour, as in Lumbricus terrestris, to a lipochrome. This 
is soluble in alcohol with a pale yellow colour and in other 
lipochrome solvents; in the former it showed a band in blue, 
in green, and perhaps another in violet, the former from about 
A 503 to X 468. The residue left by evaporating this solution 
became a transient blue and green with nitric acid, and reddish- 
brown with sulphuric acid. 
Extracted with absolute alcohol the integument yields a 
greenish-yellow solution, which evidently contains the same 
pigment as that of the digestive gland, as a band was present 
from about X 503 to X 468. The yellowish residue from this 
solution was soluble in ether, chloroform, and other lipochrome 
solvents. In chloroform two bands were perceptible, the first 
from about A 503 to A 474, and second about A 465 to Xr 446. 
The yellow residue from this became blue and greenish with 
nitric acid, and reddish brown and violet blue with sulphuric 
acid. The ether solution showed these bands also: the first 
from X 500 to A 468, and second from dX 472 to r 443. 
So that here a chlorophan-like lipochrome was present. 
Probably the black melanoid or melanin of the skin is derived 
from this yellow liprochrome, as Krukenberg infers in other 
cases. I think at all events the liprochrome met with in the 
skin is built up in the glandular organs surrounding the intes- 
tine, as in many other animals. 
Terebella.—Besides the hemoglobin abundantly present (as 
Professor Lankester has shown), this Cheetopod contains a lipo- 
chrome in its tentacles and integument. Thus an alcohol extract 
of the tentacles was pale yellow or greenish-yellow and showed 
two bands: the first from about A 500 to A 468, and the second 
462 to 441. Anether solution showed similar bands. The 
yellow residue from these solutions was soluble in lipochrome 
solvents, and reacted as a lipochrome with nitric and sulphuric 
acids. 
