ON THE DEVELOPMENT OF LICHENOPORA VERRUCARIA, 103 
of the “ brown bodies.” Barrois (2 and 3) has shown that the 
brown body formed by the degenerating parts of the larva 
during metamorphosis has disappeared completely by the time 
that the first polypide is mature. He has not, however, de- 
scribed the way in which this disappearance takes place. 
Ostroumoff (16, p. 185) states that the cecum of the primary 
polypide is formed ‘“ at the cost of the brown body;” but he 
does not enter into further details. 
I can confirm Barrois’ statements with regard to the dis- 
appearance of the degenerated remains of the larva, since I 
have found that the primary zocecium, when very young, pos- 
sesses a mature polypide, but has no trace of a brown body. 
I have found this condition lasting till the stage is reached 
when z” has a mature polypide, and z’ possesses either a bud or 
amore or less mature polypide. At a later stage the primary 
zocecilum contains a brown body as well asa polypide. The 
smallest colonies in which I have found this condition mea- 
sured *33 X ‘16 mm. and *35 x ‘21 mm. respectively. This 
implies that the functional polypide is in these cases not the 
original tenant of the zocecium, although in some colonies of 
the same or even a larger size I have found no brown body. 
The degeneration of a polypide, in fact, results in the forma- 
tion of a “brown body,” which in the younger stages of the 
colony nearly always remains as a distinct structure in the 
zocecium. In the older stages, as we shall have occasion to 
see, the brown bodies commonly disappear from the zocecia. 
When present they are easy to recognise, as they appear as 
bright yellow bodies even in sections which have been stained 
with Grenacher’s hematoxylin. A part of the cecum of the 
stomach has the same colour in sections. 
I do not think that the primary polypide of z! develops a 
testis, although that organ is commonly present as an append- 
age of the polypide of z' in cases where the corresponding 
zocecium possesses a brown body, 
