Bulletin of the Museum of Comparative Zoology at Harvard College . igure 86, showing atrium, ganglion, and rectum. X 430. Fig. 88. Vertical section through a bit of roof of corm of EschareUa variabilis atneck of polypide, showing also the region of future operculum and oforigin 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 theganglion and rotation of the oral tentacles. X 320. Fig. 90. Vertical section of a bit of body wall from same ind
Bulletin of the Museum of Comparative Zoology at Harvard College . igure 86, showing atrium, ganglion, and rectum. X 430. Fig. 88. Vertical section through a bit of roof of corm of EschareUa variabilis atneck of polypide, showing also the region of future operculum and oforigin 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 theganglion 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 thanat 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 shrunkenfrom cuticula. X 410. Fig. 92. Section through a regenerated polypide of EschareUa variabUis, showingrelations of alimentary tract to brown body {p;jd. dgn.). X 410. Davenpob-T. -Budding pyddgn Davenpobt. — Budding ia Br^ozoa. PLATE XI. ABBREVIATIONS. cev. ooe. Neck of ooecium. msdrm. Mesoderm. coel. Coelom. ooe. Ooecium. ecdnn. Ectoderm. ov. Ooblasts. endnn. Entoderm. pyd. Polypide. ex. Outer layer of bud. sto. Stolon. i. Inner layer of bud. tct. Koof of stock. lu. am. Lumen of the bud. Fig. 93. A portion of a longitudinal section through a young stock of Plumatellapolymorpha, about two weeks after hatching from statoblast (killed12th May, 1890), showing the body wall just analward of the neck ofa young polypide (pyd.), at the oral side of which a younger arisen. The inner (mesodermal) layer of the body wallshows ooblasts (ov/) in various stages of development. X 600. Fig. 94. Longitudinal section of ooecium of Cristatella showing embryo which isgiving rise to the coelomic epithelium by ingression of cells at itsproximal pole, — i. e. the pole nearest the neck of
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