. Breviora. 1959 nxKAh aki;a of i'kotopterijs types of cells have been observed: the sensory cells and the su])- ])()rtiiiji- cells. The primary sensory cells (N. Holinren 1918, 1!»2U, Friedrich-Freksa 1!>.'}2, Rascinin 1958, and others) in Pi-otoj)f(ri(s, as ill most teleosts, can be dilt'erentiated from the snpportin<i' cells ("Stiitzzellen," Friedrich-Freksa 19;}2) which show a stron<i' attinity t'oi- the acid fuchsiii of Mallory's stain especially the hyperchromatic nnclei of the cells. The cyto|)lasm of the sujiportinji' cells is reduced and the cell membranes seem almo
. Breviora. 1959 nxKAh aki;a of i'kotopterijs types of cells have been observed: the sensory cells and the su])- ])()rtiiiji- cells. The primary sensory cells (N. Holinren 1918, 1!»2U, Friedrich-Freksa 1!>.'}2, Rascinin 1958, and others) in Pi-otoj)f(ri(s, as ill most teleosts, can be dilt'erentiated from the snpportin<i' cells ("Stiitzzellen," Friedrich-Freksa 19;}2) which show a stron<i' attinity t'oi- the acid fuchsiii of Mallory's stain especially the hyperchromatic nnclei of the cells. The cyto|)lasm of the sujiportinji' cells is reduced and the cell membranes seem almost to enclose nuclei. lIoAvever, compared to teleost fishes, Pineal organ Commissura posterior. Org, subcommissuraiis 0.^ mm. Fig. 1. St-hematical picture of the pineal area and adjacent stnictures of the dipnoan fish, Prntopterus annericn.'i. The conspicuous paraphysis (Pa) is situated anterior to the velum transversuni (Ve). there are very few supporting cells present in the pineal organ of Prntopterus. The primary sensory cell-type has a well defined nucleus with nucleoli, and the cytoplasm had a distal process simi- lar to that of the ami^liibian sensory cell-type (N. Holmgren 1918, Bargmann 1943). The sensory cells in teleosts have been found to be secretory in nature (X. Holmgren. 1920). Since the pineal sensory cells resemble both those of the teleosts and the amphibians and there is a significant decrease in supporting. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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