Datesport. — Budding iu Brjozoa. 



PLATE X. 



ABBREVIATIONS. 



An. Anal side of polypide. 



ail. Anus. 



atr. Atriuui. 



can. crc. Ring canal. 



cev. pyd. Neck of polypide. 



c<e. Coecura. 



eta, Cuticula. 



di'sep. Wall of zooeeium in the corm. 



ec'dnn. Ectoderm. 



ex. Outer layer of bud. 



fun. Funiculus. 



ga. Stomach. 



f/n. Ganglion. 



i. Inner layer of bud. 



kmp'dnn. Kaniptoderm. 



lu. gn. Lumen of the ganglion. 



ms'drm. Mesoderm. 



mu. Musculature of oesophagus, 



mil. ret. Retractor muscle of polypide. 



ce. (Esophagus. 



Operculum. 



Oral side of polypide. 

 or. Moutli. 



pyd. dgn. Degenerated polypide, " brown 



body." 

 rt. Rectum. 



ta. Tentacle. 



op. 

 Or. 



Fig. 83. Sagittal section through young polypide of Escharella variabilis. X 320. 



Fig. 84. Regenerated polypide of Lepralla Pallasiana on operculum {op.). X 380. 



Fig. 85. Cross section of pharynx of adult polypide of Escharella variabilis, show- 

 ing perforated cell walls. X 635. 



Fig. 86. Sagittal section of young polypide of Lepralia Pallasiana, showing forma- 

 tion of brain. X 320. 



Fig. 87. Section parallel to sole of a corm of Escharella rariabilis at about the stage 

 of Figure 86, showing atrium, ganglion, and rectum. X 430. 



Fig. 88. Vertical section through a bit of roof of corm of Escharella variabilis at 

 neck of polypide, showing also the region of future operculum and of 

 origin of future regenerated buds. Compare with Figure 90. X 410. 



Fig. 89. Sagittal section of young regenerated polypide of Flusirella hispida inter- 

 mediate in age between Figures 86 and 83. Shows the origin of the 

 ganglion and rotation of the oral tentacles. X 320. 



Fig. 90. Vertical section of a bit of body wall from same individual as Figure 88, 

 to show the comparatively less embryonic condition of cells here than 

 at neck of polypide. X 410. 



Fig. 91. Operculum of Lepralia Pallasiana cut perpendicularly to surface, show- 

 ing origin of a regenerating polypide. Body wall somewhat shrunken 

 from cuticula. X 410. 



Fig. 02. Section through a regenerated polypide of Escharella variabilis, showing 

 relations of alimentary tract to " brown body" {pyd. dgn.). X 410. 



