Davenport. — Buddiug in Bryozoa. 



PLATE XII. 



ABBREVIATIONS. 



ec'drm. Ectoderm. jns'drm. Mesoderm. 



ex. Outer layer of bud. oce. Ooeeium. 



i. Inner layer of bud. sto. Stolon. 



lu. gm. Lumen of the bud. 



Fig. 100. Longitudinal section of a larva of Plumatella polyviorpha, in which the 

 two layers are established; tlie pole of ingression is directed upward, 

 on the plate. 



Fig. 101. Section of upper part of zooecium of CristateUa mucedo, with its contained 

 larva. Showing the formation of tiie stolon at the pole of Ingres 

 sion and the attachment of this pole to the placenta-like neck of the 

 ooeeium (*). X 390. 



Fig. 102. Section through an ocecium of CristateUa, with its contained larva. One 

 polypide is already' established, and a second is arising. The two 

 are the only buds in tiie 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. X 390. 



Fig. 103. Section through the two oldest polypides of the CristateUa larva, to- 

 gether with the stolon. This larva contains one other less developed 

 bud at one side of these two. X 390. 



Fig. 104. Plumatella po!i/n:orpha. Stage of first bud later than that shown in 

 Figure 96, exhibiting pore of invagination closed by overgrowth of 

 ectoderm. X 390. 



