On the Chromatology of the Blood of Some 
Invertebrates. 
By 
C. A. Mac >1 linn, M.A., M.D. 
With Plates XXXIII and XXXIV. 
The following account of a few observations made by me 
during the last two years on the blood of some invertebrate 
animals may prove of use to others engaged in the same kind 
of work, and although the observations are not by any means 
complete, I have thought it advisable to publish the results, 
with the remark that the present account is merely a pre- 
liminary one, and that I hope to follow up the subject more 
fully when an opportunity occurs of doing so. 
As is well known, the colour of the blood in invertebrate 
animals does not as a rule belong to the corpuscles, but to 
what in them answers to the liquor sanguinis of Vertebrates, 
although there are many exceptions. In some haemoglobin 
occurs. Thus, Prof. Lankester has shown 1 that in Glycera, 
Capitella and Phoronis, and in Solenlegumen, it is found 
in special corpuscles ; while in the vascular fluid of others it is 
found dissolved, e.g. with certain exceptions in some Chaetopod 
Annelids, in some Leeches (Nephelis, Hirudo), in Polia 
sanguirubra (a Turbellarian), in the special vascular system of 
a marine parasitic Crustacean observed by E. van Beneden,in the 
general blood-system of the larva of the midge (C hironomus), 
in the general blood-system of the Mollusk PI an or bis, and 
in the general blood-system of the Crustaceans Daphnia and 
1 “ A Contribution to the Knowledge of Haemoglobin,” ‘ Proc. Roy. Soc.,’ 
vol. xxi (1872), p. 71, &c. 
VOL. XXV. NEW SER. 
H H 
