Image from page 83 of “Text-book of comparative anatomy” (1898) – more Marine Life goodness curated by www.SardineRunPE.co.za
Image by Internet Archive Book Images
Title: Text-book of comparative anatomy
Year: 1898 (1890s)
Authors: Lang, Arnold, 1855-1914 Bernard, Henry Meyners Bernard, Matilda Haeckel, Ernst Heinrich Philipp August, 1834-1919
Subjects: Anatomy, Comparative
Publisher: London, New York, Macmillan and Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library
Click here to view book online to see this illustration in context in a browseable online version of this book.
Text Appearing Before Image:
> cm, embryo. Fro. 54.—Rhopalura Giardii, O , afterJulin. and form the ectoderm, and, in the Orthoncctidce, the muscular fibres aswell. The large cell remains undivided in the Dicyemidce and be-comes the axial cell, while in the Orthonectidce it yields by division thegroup of endodermal cells. Appendage : Triehoplax adhoerens (Fig. 55).—This is a remark-able animal discovered in the Graz marine aquarium, which presentsthe appearance of a thin flat ciliated body like an Amcela, irregularand varying in shape. It is composed of three layers—the lowest,which adheres to the surface on which the animal rests, consists ofcylindrical cells, the uppermost of tesselated epithelium. The layer GO COMPARATIVE ANATOMY CHAP. between these consists of branched and partly anastomosing cells,which lie in a hyaline ground substance. The cells of the lowest layerpossess processes, which pass into the processes of the cells of themiddle layer without sharp distinction. As long as we have no know-
Text Appearing After Image:
Fio. 55.—Part of a vertical section through the body of Trichoplax adhaerens, after F. E. Schulze. ledge of the reproduction and development of this animal, judgmentas to its morphology must be suspended. [Note.—Of. p. 175. Where the author suggests that the Dicyemidce and Ortho-ncctidcc, on account of their similarity to the sporocysts, are degenerated Trcmatoda.-Tr.] Literature. E. Haeckel. Biologische Studien. Heft II. 1877. Ed. van Beneden. Rcchcrches sur les Dicyemides. Bull. Academic Bclgique. Bruxelles, 1876.C. O. Whitman. A Contribution to the Embryology, Life-History, and Classification of the Dicycmids. Mitthcil. aus d. zool. Station zu Neapel. T. IV. 1882.A. Giard. Lcs Orthonectidcs. Journal de V Anatomic et de la Physiologic. T. XV. 1879. E. Metschnikoff. Untcrsuchungen iibcr Orthoncctiden. Zeitschr. f. wiss. Zoologie. Bd. 35. 1881. Julin. Contribution it Vhistoire dcs Mesozoaires. Archives de Biologic. T. III.1882. F. E. Schulze. Ucbcr Trichoplax, adhaerens. Zoolog. A
Note About Images
Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability – coloration and appearance of these illustrations may not perfectly resemble the original work.