. Text-fig. 18. Swimbladders of Benthosema suborbitale (a, b, c), and B. glaciate (d-f). a, c, d, e, lateral views; b, dorsal view. The almost closed oval of B. glaciale is seen in diagrammatic transverse section and from below in (f). bl, urinary bladder; gg, gas-gland; int, intestine; k, kidney; ov, oval; oy, ovary; ra, retial artery; rv, retial vein; rm, rete mirabile; st, stomach; vov, vein to oval, (a, x 11-5; b, x 15; c, x 15; d, x 11; e, x 10; f, x 20.) Benthosema suborbitale (Gilbert) (Text-fig. i8a-c) St. 2067, 24°i2'N., 210 12-2'W., 12. v. 37, N450H, 68(-o) m. B.M. Reg. no. 1948.5.14

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. Text-fig. 18. Swimbladders of Benthosema suborbitale (a, b, c), and B. glaciate (d-f). a, c, d, e, lateral views; b, dorsal view. The almost closed oval of B. glaciale is seen in diagrammatic transverse section and from below in (f). bl, urinary bladder; gg, gas-gland; int, intestine; k, kidney; ov, oval; oy, ovary; ra, retial artery; rv, retial vein; rm, rete mirabile; st, stomach; vov, vein to oval, (a, x 11-5; b, x 15; c, x 15; d, x 11; e, x 10; f, x 20.) Benthosema suborbitale (Gilbert) (Text-fig. i8a-c) St. 2067, 24°i2'N., 210 12-2'W., 12. v. 37, N450H, 68(-o) m. B.M. Reg. no. 1948.5.14. 185-91. Standard length of fish 24 mm. (4-3 x 1-3 mm.). A thin-walled swimbladder originates over the forepart of the stomach and extends over some two-thirds of the length of the body-cavity. The gas-gland invests the floor of the foremost third of the organ. As in all myctophids, the gland receives three retia mirabilia, which enter the anterior and lower part of the swimbladder. 5-2