. Text-fig. 25. Swimbladder of Stylophorus chordatus, seen (a) from below, and (b) in the body-cavity of the fish, en, capillary network; gg, gas-gland; k, kidney; lu, lumen of swimbladder; rm, rete mirabile; sb, swimbladder; st, stomach, (a, x 15; b, x 1-8.) Order ALLOTRIOGNATHI Family Stylophoridae Stylophorus chordatus Shaw (Text-fig. 25) St. 296, 8° 12' N., 180 49' W., 26. viii. 27, TYF, 45o-5oo(-o) m. Standard length 177 mm. This individual contained a small elongated swimbladder, lying just below the black-speckled kidneys and originating a little before the pyloric end of the stomach. T
. Text-fig. 25. Swimbladder of Stylophorus chordatus, seen (a) from below, and (b) in the body-cavity of the fish, en, capillary network; gg, gas-gland; k, kidney; lu, lumen of swimbladder; rm, rete mirabile; sb, swimbladder; st, stomach, (a, x 15; b, x 1-8.) Order ALLOTRIOGNATHI Family Stylophoridae Stylophorus chordatus Shaw (Text-fig. 25) St. 296, 8° 12' N., 180 49' W., 26. viii. 27, TYF, 45o-5oo(-o) m. Standard length 177 mm. This individual contained a small elongated swimbladder, lying just below the black-speckled kidneys and originating a little before the pyloric end of the stomach. The sac measured about 12-5 mm. in length and i-o mm. in diameter and is attached by a mesentery to the dorsal wall of the stomach. Within the mesentery is an artery and vein running close together to the anterior end of the sac. The two vessels continue together for about 3 mm. along the left-hand lateral walls and then sub- divide to form a single rete mirabile having a length of about 2 mm. The rete enters the lumen of the sac about half-way along its length (of about 4 mm.). Examination of serial transverse sections revealed the disposition of the resorbent and glandular parts of the swimbladder. The capillaries of the former lie just below the inner epitheleum and occur over much of the lumen anterior to the point of entry of the rete. The glandular tissue lies behind this point in the posterior half of the lumen. In supplying the gland, the retial capillaries do not unite to form larger vessels. The rete is thus unipolar.
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
