4 8 



DISCOVERY REPORTS 



Text-fig. 28. Swimbladders of Anoplogaster longidens (a) seen from below; Melamphaes misolepis, (b) lateral view, (c) dorsal 

 view, (d) lateral view; M. unicornis, (e) dorsal view; (f) lateral view, ft, fat investment; gg, gas-gland; ov, oval; rm, rete 

 mirabile. (a, x 8-5 ; B, C, d, x 25 ; e, x 10 ; F, x 6.) 



From this dissection it would appear that in adult Anoplogaster the swimbladder can have very 

 little hydrostatic function. 



Order PERCOMORPHI 



Family Chiasmodontidae 



Chiasmodon niger Johnson (Text-fig. 29) 



St. 239, 46°56'S., 46°03'W., 2. vi. 27, N 450 H, io50-i35o(-o) m. B.M. Reg. no. 1930.1.12. 1058. Standard 

 length 50 mm. (8-o x 1-5 mm.). 



Position, 6° 55' N., 15 54' W., 2-m. tow-net, horizontal, 8oo(-o) m. B.M. Reg. no. 1930. 1. 12. 1057. Standard length 

 49 mm. (8-o x 1-5 mm.). B.M. Reg. no. 1922.5.26. 1-2. Madeira. Standard length 104 mm. (21-0 x 3-0 mm.). 



In each of the three fishes examined, the swimbladder is an elongated ellipsoidal sac, which in the 

 104 mm. specimen occupied the greater part of the upper half of the body-cavity. 



The retia are formed from an artery and vein that enter the forward tip of the sac. In the 49-mm. 

 fish there were eight, each running backward to supply a corresponding lobe of the gas-gland and 

 having a length of 3-25 mm. A closely similar retial measurement was also obtained from the 

 largest individual. 



