DR. C. A. MAC MUNN ON THE CHROMATOLOGY OE ACTHSTlzE. 663 
CHART III. Plate 70. 
Sp. 1. Spectrum of endoderm (of body cavity) of a small Bunodes ballii. 
Sp. 2. Ectoderm of small orange Sagartia dianthus. 
Sp. 3. Rectified spirit and caustic potash extract of ectoderm of a brown Sagartia 
dianthus (trace of hsemochromogen ?). 
Sp. 4. Rectified spirit and caustic potash extract of ectoderm of Sagartia viduata. 
Sp. 5. Endodermal parts of Sagartia parasitica in rectified spirit and caustic potash 
after addition of ammonium sulphide. 
Sp. 6. Rectified spirit and caustic potash extract of ectoderm of Sagartia parasitica. 
Sp. 7. Thinner layer of the same. 
Sp. 8. The same solution with ammonium sulphide. 
Sp. 9. Absolute alcohol extract of ectoderm of Sagartia parasitica. 
Sp. 10. Thinner layer of same. 
Sp. 11. The same with sulphide of ammonium. 
Sp. 12. Alcoholic solution of this colouring matter with ammonia. 
Sp. 13. Spectrum obtained from ectoderm of Sagartia troglodytes. 
In other parts a second band nearer violet is seen. 
CHART IV. Plate 70. 
Sp. 1. Spectrum due to “ yellow cells ” in tentacles of Sagartia bellis. Cf. Chart II., 
spectra 8 and 10, and also 8, infra. 
Sp. 2. Rectified spirit and caustic potash extract of ectoderm of same. 
Sp. 3. Absolute alcohol solution of the tentacles of same. Cf. spectra 9 and 12, 
also 9, infra. 
Sp. 4. The same with nitric acid, early stage of reaction. 
Sp. 5. Change of spectrum of an alcoholic solution of tentacles with caustic potash. 
Sp. 6. Actiniochrome in the tentacles of Anthea cereus. 
Sp. 7. An empty tentacle of Anthea cereus ( i.e ., free from yellow cells). 
Sp. 8. A tentacle full of “ yellow cells.” Cf. 1, supra, &c. 
Sp. 9. Absolute alcohol extract of tenta.cles of Anthea cereus. 
Sp. 10. The same with nitric acid, early stage of reaction. 
Sp. 11. The same with nitric acid, later stage of reaction. 
Sp. 12. An alcoholic solution of the tentacles of Anthea cereus with caustic soda. 
Cf. also spectrum 5, supra, also Chart II., 15. 
Sp. 13. Rectified spirit and caustic potash extract of ectoderm, &c. 
Sp. 14. An alcoholic solution of the same pigment with ammonium sulphide. 
Sp. 15. Glycerin extract of the tentacles of a specimen of Anthea cereus; it showed 
a splendid green fluorescence, but this pigment does not occur in every 
.specimen of Anthea cereus. 
4 Q 2 
