STOLON FORMATFON IN SPECIES OF TEYPANOSYLLIS, 421 
T. gemmipava are not displayed here. New stolons are 
still being formed, but the effect of the great amount of 
growth which has taken place in the posterior rows has been 
to draw out the eud of the stock into a sort of pedicle, Avhich 
has been turned back over the dorsum, so that the anus 
Text-fig. I. 
DovsOjL. Sep. 
// k 
^ 1 
VentraL 
Vertical longitudinal section through posterior end of stock to left of 
middle line (T. crosslandi, I). showing a newly formed prolife- 
rating cushion with several rows of stolons established, all as yet 
unseginented. am. Leucocytes, free in coelom and invading meso- 
blast. ect. Ectoderm, mes. Mesoderm. I.m. Longitudinal muscles 
of stock, sep. Septa in stock, st. Rudimentary stolons, x 120. 
points anteriorly. This gives off secondary processes, to 
which the now fully formed stolons are attached, each by a 
distinct stalk. 
