434 
F. A. FOTTS. 
\ 
The Proliferating Cushion in Later Stages. 
Text-fig. 5, a longitudinal section througli the posterior 
extremity of T. gemmipara (IX), shows the changes in the 
proliferating cushion which accompany development of the 
stolons. It will be noticed that the size of the cushion has 
increased greatly with the number of the stolons. The genital 
appendage, which appears in fig. 4 as if it would restrict the 
Text-fig. 5. 
Longitudinal section througli posterior end of budding stock (T. 
geniinijiara, IX) after detachment of dorsal stolons, an. Anus. 
ped. Position from which a stolon has been detached, st. m. Bands 
of longitudinal muscles supplying stolons, vac. Vacuolated meso- 
blast in the exhausted portion of the proliferating cushion. X 50. 
growth of the cushion, is not present in this section. It has 
been pointed out above that it has probably developed as a 
stolon, remaining attached only by a pedicle, and was detached 
soon after preservation. The oldest stolons, pushed dorsal- 
ward by the growth of new rows behind them, have all 
matured, and were also inadvertently detached in examining 
the animal. But there remains in the cushion of proliferation 
the bundles of muscle-fibres running from stock to stolon, and 
i 
