. Text-fig. 37. Three types of gas-glands in bathypelagic fishes; (a) consisting mostly of giant cells {Vinciguerria), with intra- cellular capillaries; (b) with medium-sized cells (Polyipnus), and (c) with small cells (Myctophidae). The base of the cell of Vinciguerria is 170/1 in length, while the cell of Polyipnus fitting into the U-bend of a capillary is about 50//. wide. The cells of Myctophum are from 10 to 17/* in length along their longer axes, ic, intracellular capillary; pec, pericapillary cytoplasm. cells and the capillaries supplying them is within the cytoplasm. Secondly, these in
. Text-fig. 37. Three types of gas-glands in bathypelagic fishes; (a) consisting mostly of giant cells {Vinciguerria), with intra- cellular capillaries; (b) with medium-sized cells (Polyipnus), and (c) with small cells (Myctophidae). The base of the cell of Vinciguerria is 170/1 in length, while the cell of Polyipnus fitting into the U-bend of a capillary is about 50//. wide. The cells of Myctophum are from 10 to 17/* in length along their longer axes, ic, intracellular capillary; pec, pericapillary cytoplasm. cells and the capillaries supplying them is within the cytoplasm. Secondly, these intracellular capillaries connect with one another through fine canals in the cytoplasm, the lumen of the canals being little more than ifi across, too fine to admit the elliptical red blood corpuscles, which are about 6-8 n long and 2-3^ wide. A number of workers (see Fange, 1953) have observed that the cytoplasm around the capillaries stains differently from the remaining cell contents. I have also seen this in the gas-glands of Argyro- peleats, Polyipnus, Vinciguerria, Maurolicus, Cyclothone and Opisthoproctus. After staining with
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