. A text-book of invertebrate morphology. Invertebrates. Pia. 34.—An Ascon Fig. 35.—Diagram to show the General Structure of a Sycon Sponge. mordialis (after Hak- The upper portion represents the simplest con- cKELfrom SoLLAs). dition, tlie complexity increasing downwards. ec = ciliated chamber. ic = inhalent canal. Os = osculum. p = inhalent pore. pr — prosopyle, it and the ectoderm is the mesogloea, in which are imbedded large numbers of cells, giving it almost the appearance of a cellular layer. In such simple Sponges the mesogloea is comparatively thin and the pores open
. A text-book of invertebrate morphology. Invertebrates. Pia. 34.—An Ascon Fig. 35.—Diagram to show the General Structure of a Sycon Sponge. mordialis (after Hak- The upper portion represents the simplest con- cKELfrom SoLLAs). dition, tlie complexity increasing downwards. ec = ciliated chamber. ic = inhalent canal. Os = osculum. p = inhalent pore. pr — prosopyle, it and the ectoderm is the mesogloea, in which are imbedded large numbers of cells, giving it almost the appearance of a cellular layer. In such simple Sponges the mesogloea is comparatively thin and the pores open almost directly into the coelenteron lined by the collared cells. This arrangement constitutes the first or Ascon type of structure. In the majority of forms a much greater complexity arises from the walls of the simple cylinder being, as it were, drawn out into a number of finger- like processes, each of which communicates by a wide open-. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
Size: 1061px × 2354px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
