Davenport, — Budding in Bryozoa, 
PLATE XII. 
ABBREVIATIONS. 
ec’drm. Ectoderm. ms’drm. Mesoderm. 
ex, Outer layer of bud. ow. Ocecium. 
i. Inner layer of bud. sto. Stolon. 
lu. gm. Lumen of the bud. 
Fig. 100. Longitudinal section of a larva of Plumatella polymorpha, in which the 
two layers are established; the pole of ingression is directed upward, 
on the plate. 
Fig. 101. Section of upper part of zoæcium of Cristatella mucedo, with its contained 
larva. Showing the formation of the stolon at the pole of ingres- 
sion and the attachment of this pole to the placenta-like neck of the 
oweium (*). X 390. 
Fig. 102. Section through an ocecium of Cristatella, with its contained larva. One 
polypide is already established, and a second is arising. The two 
are the only buds in the larva. On the left of the older bud the 
stolon is seen to be intruding itself between the ectoderm and meso- 
derm of the larva. 390. 
Section through the two oldest polypides of the Cristatella larva, to- 
gether with the stolon. This larva contains one other less developed 
bud at one side of these two. 890. 
Fig. 104. Plumatella polymorpha. Stage of first bud later than that shown in 
Figure 96, exhibiting pore of invagination closed by overgrowth of 
ectoderm. X 3890.. 
