132 SIDNEY F. HARMER. 
it is by no means restricted to these. Brown bodies are absent 
in a considerable number of colonies in Stage F, and rarely in 
earlier stages, sometimes occurring even in quite young 
colonies. 
Whatever the fate of other brown bodies, the fertile brown 
body always occurs in a normal colony. I have not examined 
many colonies larger than 15 mm. in diameter, and I cannot 
say how long this structure remains compact. In one colony 
I found a fertile brown body which had almost divided into 
two, and I have also noticed a brown body of the second 
generation of embryos divided into a considerable number of 
fragments which are contained in the embryophore. In all 
the colonies I have examined in Stage G the fertile brown body 
is still compact. 
The Occurrence of Second Broods of Embryos. 
My observations on this part of the development are very 
incomplete, but I have noticed one or two facts of interest. 
There is no doubt that new broods do make their appearance 
in old colonies, and this may possibly indicate a second year’s 
growth (cf. p. 89). That we are not here dealing with the 
first brood is shown by the large size of the colony, and by the 
fact that it possesses a large ovicell, which, however, contains 
no embryos. 
I have not traced the first origin of the new brood of embryos. 
Fig. 36 is from a colony 2°2 mm. in diameter. No other pri- 
mary embryo was found. Most of the polypides had enormous 
testes, and a few had egg-cells in a corresponding position 
near the apex of the cecum. The embryo is carried by an 
embryophore supported by a fertile brown body, and corre- 
sponds in general with Stage D or E of the first brood. Ihave 
not been able to obtain a stage intermediate between the 
occurrence of eggs at the lower end of a polypide and the 
section figured. It does not appear to me probable that a 
normal suspensor is formed. The cells which surround the 
embryo are exceedingly loose and scanty, and the part of the 
embryophore between the brown body and the embryo is short 
