24 



DISCOVERY REPORTS 



Text-fig. ii. Swimbladder of Astronesthes niger, seen (a) in fish; (b) laterally, and (c) ventrally. Veins shown black, arteries 

 white, av, artery-vein pair to gas-gland; bpr, by-pass branch of retial artery; gg, gas-gland; k, kidney; ra, retial artery; 

 rv, retial vein; rm, rete mirabile. (a, x 2; b, x 8; c, x 12.5.) 



