TWO NEW SPECIES OP THE PHOEONIDEA. 
269 
a delicate sti-iation. They do not stain with Delafield’s 
haeniatoxylin, but take up iron-hsematoxylin and stain homo- 
geneously like the yolk-spherules. 
Besides the above substance quantities o£ refringent non- 
staining granular substance (Fig. 16, p. g.) occur in the vaso- 
peritoneal tissue, either in separate granules or massed 
together, and contained in corpuscles similar to the spliEeruli- 
ferous corpuscles described by Durham ( 4 , p. 329) in Asterias 
rubens. 
I have seen corpuscles associated with degenerating- blood- 
corpuscles or with fusiform bodies and others filled to a 
greater or less extent with these refringent gi-anules, in the 
vaso-peritoneal tissue (Fig. 16, 'pg.c.), and also free in the 
body-cavity, sometimes close to the body-wall between the 
fascicles of longitudinal muscles (Figs. 3 and 14, c.). 
It is apparently these same bodies which are often to be 
seen traversing the body-wall (Fig. 12, py. c.), and they seem 
to be similar to the wandering cells, described by Durham in 
Echinoderms (5, p. 88), which are able to get rid of effete 
material frotn the system. The granules are set free on the 
surface (Figs. 2, 12, where they form the opaque white 
pigment masses so conspicuous in some specimens on the 
outside, especially on the tentacles and distal parts of the 
body. 
Micro-chemical tests showed that these granules are 
unaffected by weak acids, alkalies or ether, as well as by 
the ordinary reagents and stains. They also give the 
murexide reaction, and therefore contain some uric acid com- 
pound. It seems probable that this may be guanin, which 
is such a common excretory substance in many invertebrates. 
'I’he deposit of these pigment granules in the distal 
regions of the body Tiiay be accounted for by the action of 
light, but, if, as 1 feel confident, they are excretory products, 
we should expect, as Hai-mer (8, p. 122) has pointed out for 
the excretory vesicles of Tubulipora, that they would occur 
childly in such regions where waste products would be most 
easily carried away. 
