76 C. A. MAC MUNN. 
The integument also tinges alcohol a yellow-green colour, 
and the contained pigment is identical with that of the ten- 
tacles, both as regards solubility, action of mineral acids, and 
spectrum. Hence here also a chlorophan-like lipochrome is 
present. 
Cirratulus.—This hemoglobin-containing Chetopod shows 
in some of its tentacles when deprived of their oxy-hemoglobin 
a greenish tint. The integument showed besides the bands of 
oxy-hzemoglobin another in the blue end of green. In C. ten- 
taculatus the alcohol solution of the tentacles had a faint 
yellowish tint, evidently due to a lipochrome also, the band of 
which extended from about A 503 to » 468, and it gave the 
usual reactions with nitric and sulphuric acids. 
The alcohol solution of the integument had a greenish-yellow 
colour, and showed one band from about X 503 to A 468, and 
another faint one in violet. This left a yellow residue with a 
faint tinge of green, soluble in lipochrome solvents and giving 
the usual reactions with mineral acids. In C. cirratus a 
similar chlorophan-like lipochrome occurs, which in chloro- 
form showed two bands; the first from about AX 503 to A 478, 
and second A 465 to A 446. (?) 
In Nereis, although in smaller quantity, a chlorophan-like 
lipochrome was also found. Nereis (as Professor Lankester 
has shown) is a hemoglobin-containing worm. 
In Polynoe I could detect no hemoglobin. There is a 
phosphorescent area round the cerebral ganglion, which latter 
is of ared colour. The red colouring matter there showed a 
band which somewhat resembled that of reduced hemoglobin. 
In most parts of this worm a band is visible at the blue end of 
green, probably due to a lipochrome. In the cerebral ganglion 
of another Polynoe I observed a band like the first one of 
oxy-hemoglobin, and in a third young specimen this ganglion 
was yellow and showed no band. I failed to detect the bands 
of oxy-hemoglobin in any of the specimens examined. The 
pigmentation of the ganglion is interesting when it is con- 
sidered that in the nearly allied Aphrodite the hemoglobin 
is limited to the ventral ganglia. Among Nemertines I have 
