ON CERTAIN GEEEN FIGMENTS IN INVERTEBRATES. 891 



On Certain Green (Chlorophylloid) Pigments 

 in Invertebrates. 



By 



Marion I. IVewMg^iii, D.Sc, 



Lecturer on Zoology in the Ediuburgli College of Medicine for Women. 

 (From the Laboratory of the lloyal College of Physicians, Edinburgh.) 



With Plates 30 and 31. 



Contents. 



Pkeliminary. 



A. Chsetopterin. 



(1) General characters. 



(2) Action of acids. 



Comparison witli bonellin. 



General characters of acidified solutions. 



(a) The ether solution. 



(i) The blue acid solution. 



(c) The green acid solution. 

 General conclusions as to action of acids. 

 Characters of the green acid derivative. 



(3) Action of alkalies. 



(a) Ammonia. 



(d) Caustic soda and potash. 



(4) Action of salts. 

 Summary. 



B. " Enterochlorophy 11." 



(1) Previous investigations. 



(2) Mode of occurrence. 



(3) Characters of solutions. 



llelation to chlorophyll. 



Characters of the associated lii)ochrome. 



(4) Action of acids. 



(5) Other reactions. 



(6) Relation to chsetopterin. 



(7) Distribution. 

 c. Bonellin. 



(1) Com[)arison with cheetopterin. 



(2) Relation to thalassemin. 



(3) Other green pigments in Invertebrates. 

 Conclusion. 



