8 DISCOVERY REPORTS 



fins (Text-fig. id). The sac is thin-walled and ellipsoidal in form, the measurements of the major 

 and minor axes in the 43-5-1111™. fish being 8-5 and 275 mm. 



Text-fig. 1. Swimbladder of Vinciguerria attenuata, viewed: (a) dorsally; (b) ventrally; (c) laterally, and (d) in position in 

 body-cavity offish. Veins shown black, arteries white, av, artery-vein pair to gas-gland ; bpr, by-pass branch of retial artery; 

 en, resorbent capillary network;^, gas-gland ; ra, retial artery; rv, retial vein; rm, rete mirabile. (a, b and c, x 10; d, x 175.) 

 Note on orientation of swimbladder, in this and subsequent figures. Where the swimbladder is drawn with the major axis 

 vertical, the anterior end is uppermost. If this axis is horizontal, the anterior end is to the left. 



In the larger fish, the rete mirabile, which is found at the rear end of the sac, is a massive cylindrical 

 structure with a length and diameter of o-8 mm. The gas-gland is a fairly broad transverse band of 



