CONTRIBUTIONS TO ANIMAL CHROMATOLOGY. 63 
is not respiratory, nor is the true tetronerythrin in the so- 
called “ roses” around the eyes of certain birds, respiratory. 
But I have some further remarks to make on this subject at 
the end of this paper. 
Halliburton! remarks, “It is, however, possibly the case 
that the granules of varying colour that occur in the blood- 
cells of different groups of animals, especially among the 
Echinoderms, are in reality lipochromes.” This remark gains 
additional significance from the above observation. In the red 
granules of the blood of many Ascidians I have reason to 
believe that a red lipochrome is also present. 
Prof. F. Jeffrey Bell in his “ Studies in the Holothuroidea? 
—Further Notes on the Cotton-Spinner,” observes: “ After 
standing in alcohol (40 per cent. over proof) for an hour, 
specimens were observed to have stained the fluid ; the solution 
was fluorescent, giving a greenish colour with reflected and a 
yellow with transmitted light. This colour does not seem to 
be lost by exposing the alcohol to sunlight; at any rate, it has 
not disappeared after an interval of more than six weeks’ expo- 
sure to daylight.’ He then goes on to show that it gives no 
absorption bands, and he compares it with Moseley’s antedonin, 
and he gives certain characters which are peculiar to it. This 
is evidently the pigment to which Krukenberg refers :3 “ Durch 
das bei Holothurien weit verbreitete braune Pigment wird in 
der Haut von Holothuria Poli ein Farbstoff verdeckt, der 
sich in Alkohol, Wasser, und Glycerin, mit gelber Farbe und 
griiner Fluorescenz leicht aufloést. Dieser Uranidin genannte 
Farbstoff Korper ist gerade deshalb von grossem Interesse, weil 
er sich in unreinen Gewebsausziigen sehr rasch zersetzt, in 
reiner alkolischer Losung aber sehr bestandig, weder licht noch 
warmeempfindlich zu nennen ist.” I have elsewhere called 
attention to Krukenberg’s observations on the so-called urani- 
dines,‘ but I may here repeat the essential points which have 
1 Loe. cit., p. 328. 
2 ¢Proc. Zool. Soc.,’ December 2nd, 1884, p. 563. 
3 *Grundziige einer vergl. Physiol. d. Farbstoffe und der Farben,’ 1884; 
and ‘ Verg}. physiol. Studien,’ zweite Reihe, dritte Abth., 1882, S. 53. 
4 “Chromatology of Sponges,” ‘Journ. Physiol.,’ vol. ix, No. 1. 
VOL. XXX, PART 2,—NEW SER. E 
