CONTRIBUTIONS TO ANIMAL CHROMATOLOGY. 51 
Contributions to Animal Chromatology. 
’ By 
Cc. Ae Mac Munn, ™.A., M.D. 
With Plate VI. 
Tue following observations, although they are not as complete 
as one might wish, may yet be found useful to those who take 
an interest in Animal Chromatology. The greater part of 
them is the result of a short visit to the Marine Biological 
Laboratory at Plymouth last'year. Owing to my having been 
provided with only one spectroscope of small dispersion at 
Plymouth, I am unable to guarantee the accuracy of the 
measurements. The chemical laboratory there was not at that 
time yet fully equipped, so that I could not thoroughly examine 
the pigments, but the characters given below are sufficient to 
enable one to form an opinion as to their connexion with other 
pigments. 
EcHINODERMS. 
Is there Spectroscopic Evidence of the Presence of 
Symbiotic Alge in Antedon rosacea? 
Some time ago Dr. P. Herbert Carpenter, F.R.S., suggested 
to me that I should examine Antedon rosacea spectro- 
scopically, so as to determine whether any chlorophyll or allied 
pigment is present. Because if chlorophyll or chlorofucin is 
absent symbiotic algee cannot be present. Dr. Carpenter, in 
the January number of the ‘ Quart. Journ. Micros. Sci.’ for 
1887, discusses this question from the microscopic side, and he 
