. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 366 YO K. OKADA. LOCALIZATION AND GENERAL STRUCTURE OF THE PHOTOGENIC ORGANS. The photogenic organs of Monocentris consist of two ovoid protuberances lying side by side on each side of the median thickening of the lower jaw, their longer diameter being nearly at right angles to the median plane (Fig. I, gl). In a fish 12 cm. long the protuberances measure about 4 mm. in length and 3 mm. in width. Their whole surface being covered with minute dermal papillae of dark brown color, the photogenic protuberances do not stand out c
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 366 YO K. OKADA. LOCALIZATION AND GENERAL STRUCTURE OF THE PHOTOGENIC ORGANS. The photogenic organs of Monocentris consist of two ovoid protuberances lying side by side on each side of the median thickening of the lower jaw, their longer diameter being nearly at right angles to the median plane (Fig. I, gl). In a fish 12 cm. long the protuberances measure about 4 mm. in length and 3 mm. in width. Their whole surface being covered with minute dermal papillae of dark brown color, the photogenic protuberances do not stand out clearly above the surrounding. FIG. i. Ventral view of the lower jaw of Monocentris japoniciis. About X 2. gl, photogenic gland; op, opening of gland. surfaces. This fact seems to be the reason why the organs in question have remained unnoticed by most ichthyologists. The photogenic organs of Monocentris are glands of an excretory nature, although luminous material does not escape under normal conditions. The glandular nature of the organs can easily be demonstrated even without dissection. Each photo- genic protuberance has a slit-like opening at the anterior end (Fig. i, op) and when pressed under conditions of darkness a luminous fluid is observed to be forced out through this point. The opening is crescentic and its longer diameter is almost parallel to that of the protuberance. The interior of the photogenic organs is white and spongy, containing a large quantity of minute crystals. A great number of simple tubules develop around the central 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred C
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
