430 MARTON I. NEWBIGIN. 



3. Krukeneekg, C. Fr. W.— " Ueber das Bonellein iind seine Derivate," 



' Vergleich. Physiol. Studien,' pp. 70 — 80, 1 fig. (Gives earlier 

 references.) 



4. Krukenberg, C. Fr. W. — " Beitrage zur Kenntniss der Actinien- 



iarbstoffe," ' Vergleich. Physiol. Studien,' 3te Abt. (1S82), pp. 72—87, 

 Ipl. 



5. Lankester.E. Ray.—" On the Green Pigment of the Intestinal Wall of 



the Annelid Chsetopterus," 'Quart. Journ. Micr. Sci.,' vol. xl 

 (1897), pp. 447—468, 4 pis. 



6. MacMunn, C. a.—" Observations on the Colouring Matters of the So- 



called Bile of Invertebrates, on those of the Bile of Vertebrates, and 

 on some Unusual Urine Pigments, &c.," 'Proc. Hoy. Soc. London,' 

 XXXV (1883), pp. 370—403, 1 chart. 



7. MacMunn, C. A.— "Further Observations on Enterochlorophyll and 



Allied Pigments," ' Trans. Roy. Soc. London ' (1886), clxxvii, p|). 

 235—266, 2 pis. 



8. MacMunn, C. A.—" Observations on the Chromatology of Actiniae," 



'Trans. Roy. Soc. London ' (1885), clxxvi, pp. 641—663, 2 pis. 



9. MosELEY, H. N. — "On the Colouring Matters of Various Animals, and 



especially of Deep-sea Forms, dredged by H.M.S. 'Challenger,'" 

 ' Quart. Journ. Micr. Sci.' (1877), xvii, pp. 1—23, 2 pis. 



10. ScHUNCK, Edward.— " Contributions to the Chemistry of Cliloropliyll," 



'Proc. Roy. Soc. London,' xxxviii (1885), pp. 336—340. 



11. Sorry, H. C— " On the Colouring Matter of Bonellia viridis," 



'Quart. Journ. Micr. Sci.,' xv (1875), pp. 166—172, 1 fig. 



EXPLANATION OF PLATES 30 & 31, 



Illustrating Marion L Newbigin's paper "On Certain Green 

 (Chlorophylloid) Pigments in Invertebrates.'" 



Fig. 1.— Absorption spectrum of normal chgetopterin for comparison with its 

 derivatives, showing four distinct bands and a trace of the band to the ri^ht 

 of D. 



Fig. 2. — Spectrum of a blue acid solution of cha;topterin, showing the 

 result of an intermixture of the green acid derivative and acidilied Chalo- 

 pteriu. 



