Davenport. — Budding in Bryozoa. 
PLATE II 
ABBREVIATIONS. 
An. Anal side of polypide. kmp’drm. Kamptoderm. 
atr. Atrium. loph. Lophophore. 
cev. pyd. Neck of polypide. ms’drm, Mesoderm. 
cl. mu. ret. Young cells of retractor mu. par, Parietal muscle. 
muscle. a. Œsophagus. 
cta. Cuticula. Or. Oral side of polypide. 
ee’dılm. Ectoderm. rt. Rectum. 
ga. Stomach. vlv, er. Cardiac valve. 
gn. Ganglion. 
All figures from preparations of Paludicella Ehrenbergii. 
Figs. 21-25. Longitudinal sections through buds of polypides at successively older 
Fig. 21. 
Fig. 22. 
Fig. 23. 
Fig. 24. 
Fig. 25. 
Fig. 26. 
Fig. 29. 
stages. The tip of the colony, and therefore the anal aspect of the 
polypide, is to the right in all cases. All figures X 410. 
Stage of Figure 87 (Plate IV.). Few nuclei in central region. 
Shows rapid growth of bud, chiefly at neck of polypide. ‘The two inner 
cell layers are about to separate to form the common cavity of atrium 
and cesophagus. 
Beginning of formation of alimentary tract at rectum, rt. The row of 
nuclei separating the atrio-esophageal cavity from the alimentary tract 
is due to the fusion of the two inner layers of the bud along this line. 
Rectum and stomach completed. Retractor muscles begin to form. 
Lophophore and young tentacles have made their appearance, and 
wsophagus and pharynx are separated from atrium. Beginning of 
formation of brain at gn. 
Part of cross section of a branch of stage of Figure 80. Parietal mus- 
cles, mu. par., occupy a diameter of the section, and are attached to 
the cuticula. X 635. 
Young parietal muscle at stage of Figure 28. This is one of the pair 
which in a later stage are found lying together in Figure 26. X 635. 
Cross section of branch showing young polypide, and reticulated vacuo- 
lated cells. x 410. 
Bit of body wall, with euticula separated from underlying ectoderm to 
show ends of parietal muscles. X 690. 
