The Shipley Collection of Scientific Papers, Volume 461891 - Zoology |
Common terms and phrases
adult alimentary canal alimentary tract anal aperture appears arise atrial atrium Barrois basal become Bismarck-brown blastomeres blastopore body wall Braem Bryozoa Bugula cæcum calyx carmine cavity cells cœlom colony colour condition contained Crisia cuticula degeneration diameter ectoderm Ectoprocta elongated embryo embryonic fission embryophore Endoprocta epithelium excretory fertile brown body fertile zoœcium Figure Flustra Flustrella follicle formation formed funicular tissue ganglion give rise granules growing-points Gymnolæmata indigo-carmine individuals inner layer invagination kamptoderm larva larvæ later stage lateral branches lateral buds leucocytes Lichenopora lophophoric margin mass median mesoderm ms'drm neck normal nuclei observed oral origin outer layer ovicell Paludicella Pedicellina Phylactolæmata pigment Plate Plumatella polypide polypide-bud Polyzoa primary embryo protoplasmic proximal rectum region secondary embryos segments septa septum shown in fig side species staining stalk statoblasts stolon stomach structure suspensor tentacle-sheath tentacles Urnatella vacuoles young polypide zoœcia Zool
Popular passages
Page 102 - There is in every stock or conn of Bryozoa a mass of indifferent cell material, which is derived directly from the indifferent cells of the larva or embryo, and whose function is to form the organs of the different individuals, including the polypides. This mass by constant growth and division affords the embryonic material for lateral branches.
Page 101 - The following Publications of the Museum of Comparative Zoology are in preparation : — Keports on the Results of Dredging Operations in 1877, 1878, 1879, and 188(1, In charge of ALEXANDER AGASSIZ, by the US Coast Survey Steamer " Blake,
Page 69 - Kraepelin ('87, pp. 155-159) has shown it to be in the highest degree probable that the...
Page 90 - ... 56). My conclusion, then, is this : Gemmiparous tissue is a rapidly assimilating tissue, possessing large nuclei because actively assimilating, and staining deeply because full of food material.1 While for Nussbaum, as already quoted (page 71), " indifferent cells" are essential to the reproduction of individuals by non-sexual as well as by sexual methods, Seeliger ('90, p.
Page 101 - Tentacles appear on the ridge of the lophophoric fold thus established, and like it are formed first at the sides of the polypide, then anteriorly and posteriorly (pages 22, 59). The posterior end of the lophophoric ridge is the last to be formed, and, in forming, it cuts off the anal part of the atrium from the intertentacular cavity (pages 23, 62).
Page 101 - Gymnolpemata (pages 31, 63, 103). The atrial opening first arises at a late period by separation of the cells of the neck. The communication plate arises in Paludicella as a circular fold of the layers of the body wall, the mesodermal cells at the centre of which become cnticularized.