. The Cephalopoda. Cephalopoda. cfusiC. figure 15. Longitudinal section of a luminous organ of Calliteuthis hoylei Goodr. Outer surface on the right: phot, luminous body; spindle-shaped cells (reflector); pg. pigmented sheath; /. lens; /'. central part of lens; n. nerves; spec, mirror: spec', distal part of mirror of the organ situated behind it; chr. chromatophores on outer surface of FIGURE 16. Section of an eye organ of Abraliopsis morisii Ver.: phot, luminous body; c. central cytoplasm with nuclei; refl'. central part of re- flector; chr. pigmented sheath, consisting of c
. The Cephalopoda. Cephalopoda. cfusiC. figure 15. Longitudinal section of a luminous organ of Calliteuthis hoylei Goodr. Outer surface on the right: phot, luminous body; spindle-shaped cells (reflector); pg. pigmented sheath; /. lens; /'. central part of lens; n. nerves; spec, mirror: spec', distal part of mirror of the organ situated behind it; chr. chromatophores on outer surface of FIGURE 16. Section of an eye organ of Abraliopsis morisii Ver.: phot, luminous body; c. central cytoplasm with nuclei; refl'. central part of re- flector; chr. pigmented sheath, consisting of chromatophores; chr'. skin chro- matophores; /. lens; lac. lacunae surrounding the posterior and lateral parts of the organ;/ thicker fibers of the lateral v/a\\\fibr. finer fibers reaching the lens; v. vessels; co. outer layer of skin (cornea). 45 separated from the refractile, strongly staining body and forms a differentiated polyhedral zone delim- ited from the adjacent cells (Plate IV, Figure 7). This homogeneous substance is often divided into lamellae (Plate IV, Figures 13). The squamous cells function mainly as reflectors, , in the Histioteuthidae, in which they are arranged in regularly intersecting curves between the luminous body and the pigmented sheath, as described already by Joubin (Plate XX, Figure 12). In other cases, they are situated on the outside of the luminous body, so that they would be able to function as a cornea or lens (Thaumatolampas, Plate IV, Figures 3, 9; Pterygioteuthis, Plate XVI, Figure 1). Finally, a few isolated squamous cells may penetrate into the luminous body (Plate XVI, Figures 1, 2, 3, 12); a compact layer of very large squa- mous cells divides the anal organ of Pterygioteuthis into an outer and an inner half (Plate XVI, Figure 12) which are held together by dish-shaped fibrous layers on the side walls of the organ. In all these cases it is difficult to determine the function of these cells in the absence of observation on the living
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
