NOTES ON THE CHROMATOLOGY OF ANTHEA CERE US. 589 



and hence I am inclined to think that the band represented in 

 Sorby's diagram in the case of "blue^' and ''yellow chloro- 

 phyll " and chlorofuciu occurring in the violet eud^ really 

 belongs to the yellow constituent^ which has been incompletely 

 separated by the " fractional " method. 



EXPLANATION OF PLATES XXXIX and XL. 



Illustrating Dr. C. A. Mac Munn's "Notes on the Chro- 

 matology of Anthea cereus." 



PLATE XXXIX. 



Transverse section of a tentacle of Anthea cereus which had been kept in 

 alcohol for some time; it was stained with picrocarraine, and mounted in 

 Canada balsam. The relationship of the "yellow cells" to the endodermal 

 lining of the tentacle is well shown. The specimen is supposed to be mag- 

 nified 80 diameters, and was drawn by means of Swift's erecting camera 

 lucida, the paper being fourteen inches distant from the eye-piece. 



The radiating cracks in the interior of the mass of " yellow cells " are 

 clearly shown, as well as the absence of any connecting structure. 



PLATE XL. 



Spectra of the colouring matters of Anthea cereus, &c. 



Sp. 1. — Absolute alcohol extract of tentacles of Anthea, deep layer. 



Sp. 2.— The same shallow layer. 



Sp. 3. — Absolute alcohol extract of other parts without tentacles. 



Sp. 4. — The same shallow layer. 



Sr. 5. — The alcohol solution of tentacles was diluted with water and agitated 

 with bisulphide of carbon, which gave this spectrum. 



Sp. 6. — Second bisulphide extract from the alcohol solution ; note the dark 

 band in violet end, which does not belong to the pigment giving bands in the 

 red end. 



Sp. 7.— The original alcohol solution after having been three times extracted 

 with bisulphide ; these are the bands of Sorby's chlorofucin. 



Sp. 8. — The same shallow depth. 



