296 DR. C. A. MAC MUNN ON MYOHAEMATIN AND THE HLSTOHH1MATINS. 
a fourth band can be seen nearer the violet which is also present in the spectrum of 
neutral hmmatoporphyrin. Hence polyperythrin is closely related to, if not identical 
with, hcematoprophyrin, and is closely related to my actiniohaematin, as this can also 
be made to yield haematoporphyrin ; so that all these observations fit into each other, 
and show, what I have endeavoured to point out, that in the lower animals we meet 
with pigments which resemble, or are identical with, decomposition products of haemo¬ 
globin, and yet are built up from a body of less complex constitution than it is. # 
In conclusion, I beg to thank the Government Grant Committee of the Royal 
Society for the grant which enabled me to purchase the instruments, reagents, and 
specimens required for this research. 
Explanation of the Charts. 
CHART I, Plate 11. 
Sp. 1. Histohaematin in the ovary of Uraster rubens, 
Sp. 2. Modified histohaematin in its stomach-wall. 
Sp. 3. Histohaematin in foot of Littorina littorea. 
Sp. 4. Do. in foot of Purpura lapillus. 
Sp. 5. Do. in mantle of Mytilus edulls. 
Sp. 6. Do. in ovary of same. 
Sp. 7. Spectrum of receptaculum seminis of Helix aspersa. 
Sp. 8. Histohaematin in the nephridium of Limax flam us. 
Sp. 9. Do, in the nephridium of another Helix. 
Sp. 10. Do. in the albumen gland of Limax. 
Sp. 11. Do. in the vas deferens of same. 
Sp. 12. Do. in stomach-wall of Astacus fluviatilis. 
Sp. 13. Modified histohaematin in the stomach-wall of another Astacus. 
Sp. 14. Histohaematin in green gland of Astacus. 
Sp. 15, Do. in the branchiae of some specimens of same, 
Sp. 16. Do. in the green gland of Ilomarus vulgaris. 
Sp. 17. Heemochromogen-like spectrum in the testes of the beetle, Staphylinus olens. 
written I Lave found haematoporphyrin in Lumbricue, and proved its identity with polyperythrin. See 
‘ Journal of Physiology,’ vol. vii., pp. 240 et seq .—June 16, 1886.] 
* Perhaps the great molecular complexity of hremoglobin is due more to its proteid than its coloured 
constituent. H. Struve tides to show that one of the colouring matters of Hemoglobin is a feeble acid 
probably combined in the blood with soda or some organic base, and proposes to name it hcematic acid, 
another agrees with Hoppe-Setler’s hsematin. (= hasmic acid of Struve). The blood-crystals would 
be, therefore, crystals of a blood-albumin coloured by these acids. Journ. prakt. Cliemie, [2], xxix., 305. 
