. photu. m. Fig. 23. Diagram of a single photo- genic unit of the uropod photophore of Systellaspis affinis. basal cap of photogenic cell; granular development of the photophores, for which a supply tip; lens-like septum; of material would be difficult to obtain, can elucidate the problem. The position of the lens, within the distal tip of the "cell", is to some extent paralleled by the condition seen in the eye of the serpulid worm Branchiomma (Dahlgren and Kepner, 1908, p. 241). Here the elongated hypodermal cells secrete a lens i
. photu. m. Fig. 23. Diagram of a single photo- genic unit of the uropod photophore of Systellaspis affinis. basal cap of photogenic cell; granular development of the photophores, for which a supply tip; lens-like septum; of material would be difficult to obtain, can elucidate the problem. The position of the lens, within the distal tip of the "cell", is to some extent paralleled by the condition seen in the eye of the serpulid worm Branchiomma (Dahlgren and Kepner, 1908, p. 241). Here the elongated hypodermal cells secrete a lens in their distal cytoplasm, but a lens-shaped nucleus is retained. It will be shown later (P- 358) that some cells of other photophores of Systellaspis affinis, like those of Hoplophorus, also lose their nuclei. clear area of photogenic cell ("unit"); proximal granular mass; i, first structureless zone; 2, second structureless zone; striated layer; vacuolated zone.
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Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
