80 BULLETIN OF THE 
ally replace a Nährthier, and the latter seems never to produce secondary 
individuals, The formula of the stock might be written : — 
(10) eR —-E—-|—-D—C— 8B — 
In Bowerbankia pustulosa we have two rows of individuals produced 
side by side from near the end of the stolon, This condition would be 
represented by 
(11) wD +O B #A 
aw *D xC *B xA 
provided the individuals of this primary series possess the power of giv- 
ing rise occasionally to secondary buds, as seems certainly to be the case 
in some members of this genus which I have seen. The spiral arrange- 
ment of some colonies is striking ; it is of evident advantage to the stock, 
but its cause in these cases is wholly unknown. 
In every one of these cases, and, in fact, in all of those figured by 
Hincks, which belong to the Stolonifera, there is no trace of dichotomy. 
Throughout we have to do with linear series, which give rise to lateral 
branches. 
Turning now from the Stolonifera to the other grand division of 
Ctenostomata, the Aleyomiide, we find the same prevalence of a law in 
budding. In its typical expression it may be written as follows : — 
* 
»* bt 
%* * (*) * 
“ga * „aaa * 
* * * 
(12) mC (*) B (*) A 
* ‘i ig 
* aA * xa aù a * 
* » (*) * 
«b * 
* 
Although secondary median individuals are not habitually formed, 
yet, owing to the capacity of regeneration possessed by individuals 
A, B, C, etc., an asterisk is affixed in parentheses to show the probable 
persistence of embryonic tissue. Of the lateral series one or both may 
fail to be developed. 
