474 
C. A. MAC MUNN. 
In AnodontacygneaC. Schmidt 1 found the blood colour- 
less. My own observations on the blood of Mollusks and 
Arthropods have been scanty, and made to determine whether 
absorption bands are present or not. I have examined the 
blood of Helix pomatia, Helix aspersa, Paludina vivi- 
pera, Limnseus stagnalis, Homarus vulgaris, Cancer 
pagurus, Carcinus msenas, and Astacus fluviatilis, but 
in none of them could I see any bands. 
The blood of Helix aspersa was found to be a bluish- 
white colour by daylight, but by gaslight it had a purplish 
tinge ; after twenty-four hours’ standing that had disappeared, 
and it was then very slightly brownish. Examined in a deep 
layer, no bands could be seen ; on treatment with ammonia, 
the blue colour persisted and no bands came into view. With 
acetic acid the blue colour persisted, and no bands appeared. 
After repeated filtering the blue colour remained, hence it 
can hardly have been due to particles in suspension. On 
treatment with reducing agents the blue colour was lost, and 
no bauds appeared. 
Blood of Helix pomatia. — The blood assumed a distinct 
blue tinge on exposure to the air, and gave no absorption 
bands, but absorbed a little of the violet end of the spectrum. 
On treatment with ammonia its colour was not so well 
marked and it had a faintly reddish tinge, but no bands 
could be seen, nor after treatment with acetic acid which did 
not remove the colour. On treatment with sulphide of 
ammonium the blue colour disappeared and could not be again 
brought back by shaking with air, the solution being free 
from bands. In some specimens exposed to the air for some 
time the fluid had assumed a bronze colour, and with gaslight 
a faint violet tint, but no bands were seen. 
red) the blood of Apus is intensely red (it contains haemoglobin like that of 
its congener Cheirocephalus, as shown by Lankester), of Gammarus violet 
(v. Siebold), of Limnadia ruby red (Klunzinger), of Palinurus (Lund and 
Schultz) and Astacus (Haeckel) pale red, ofLernanthropus (C. v. Heider) 
reddish-yellow. 
1 Lehraanu’s ‘ Physiol. Chem.,’ vol. iii, p. 256. 
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