12 
II. N. MOSELEY. 
green pigment in its appendages as is die case in allied 
shallow water forms as Phyllodice. 1 
Sabella .—A Sabella obtained from 600 fathoms contained 
chlorocruorin as do shallow-water Sabella;. 2 3 
Sagitta .—Several species of Sagitla were obtained, some 
being very large. The large ones contained an abundant 
red oily pigment soluble in alcohol, which absorbs all the 
spectrum but the red and yellow (PI. IV, fig. 1). 
Crustacea. 
Crustaceorubrin .—Many deep-sea Decapods of various 
forms are coloured of an intense scarlet. This is the case 
both with Schizopods, such as Gnathophausia and Pctalo- 
phthalmos (Suhrn), and in the Peneids and G'aridids, which are 
excessively abundant in deep water. The oily red colouring 
matter of these Crustacea is soluble in alcohol, and is in 
time entirely removed by spirit from specimens preserved in 
it. The resulting red solution gives a single broad absorp¬ 
tion band in the green and blue (PI. II, fig. 11). Addition of 
hydrochloric acid or of ammonia to the solution does not 
alter the spectrum. A similar red solution yielding the same 
spectrum is formed when large quantities of red pigmented 
surface Entomostraca are preserved in spirit. The colouring 
matter seems to be identical in the two cases. 
Pandarus .—A red colouring matter, probably the same as 
the above, was detected with the microspectroscopc in a 
Pandarus infesting a Carcharias brachiurus, which was 
caught oil’ the Kermadec Islands. So small a quantity of 
the colouring matter was present that the absorption band 
obtained was faint and not nearly so extensive as that shown 
by intense solutions from the red decapods. It is probable, 
however, that the colouring matter is the same (PI. II, 
fig. 12). 
Mollusc a. 
Aplysiopurpurin .—An Aplysia is very abundant on the 
shore at St. Vincent, Cape Verdes. Its habits are described 
by Mr. Danvin in his Journal.’ The purple fluid emitted 
by this mollusc is soluble in alcohol. It yields a broad ab¬ 
sorption band in the green and blue, consisting of a darker 
and a lighter portion in weak solutions (PI. II, fig. 13 a), 
but entirely black in intense solutions. On the solution 
being acidified it changes to a beautiful violet, and then 
1 E. R. Lankester, 'Journal of Anatomy and Physiology,’ vol. iv, p. ]21. 
- Ibid., ‘Quarterly Journal Microscopical Science,’ Nov., 1807. 
3 ‘ Darwin’s Journal,’ 2nd edition, p. 0. 
