THE TANGANYIKA PROBLEM. 
305 
this process. Instead of the evaginations of the manubrial 
wall of the parent leading into single buds, these evagina- 
tions branch, so that a short string of buds are, as it were, 
attached to a hollow pipe, and before the manubriums of 
these buds have broken through, the string of vigorously- 
pulsating individuals becomes detached, and for a time 
floats and swims about, presenting a singular analogy to a 
Siphonophoran (cf. Fig. 1). Eventually the individual 
buds become constricted off from one another, and the 
Fig. 4. — Young asexual bud of 
the Tanganyika medusa X 10, 
showing the base of the gastric 
cavity still lined with endo- 
derm. 
final stages of their evolution seems to be the same as 
that witnessed in the case of the sessile buds. 
Returning now to the consideration of the life-history of 
Limnocnida, it has been seen that at the end of the wet 
season, that is in March, there are a few adult medusae in 
the lake which are only to be found with great difficulty. 
Such individuals begin about this time to bud, asexually, in 
the manner I have just described, and the buds thus formed, 
themselves produce buds, this process being repeated 
through many generations, so that in June and July the lake 
20 
