16 DISCOVERY REPORTS 



having a length of at least 5 mm. After taking a twisting course through loose connective tissues, the 

 rete enters a heart-shaped gas-gland set in the anterior floor of the bladder. This gas-gland is re- 

 latively large, with a length of 1-4 mm. and a width of 1-3 mm. and with the glandular tissue arranged 

 in numerous lacunae. The swimbladder has thick walls consisting mainly of loosely woven connective 

 tissues formed within a viscid matrix. There was no investment of fat and this is unlikely to have 

 disappeared through leaching action, for the fish was preserved in formalin. However, Dr Aughtry, 

 who has studied the ecology of Cyclothone signata in the Monterey area, California, has written to me 

 of his finding a fat-charged swimbladder in fishes from 27-0 to 35-0 mm. in standard length. 



Text-fig. 6. Swimbladder of Ichthyococcus ovatus, viewed from above. The three lobes of the gas-gland are on the floor of 

 the sac. bpr, by-pass branch of retial artery ; en, resorbent capillary network ; gg, gas-gland ; ra, retial artery ; rv, retial vein ; 

 rm, rete mirabile. ( x 16.) 



Cyclothone braueri Jespersen & Taning (Text-fig. 8) 



St. 287, 2° 49' 30" S., 9 25' 30" W., 19. viii. 27, TYF, 85o(-o) m. Standard lengths of two individuals examined, 

 33 and 31 mm. 



St. 3094, 44 20' N., 16 49' W., 21. v. 54, TYFH, isoo(-o) m. Standard length 26-5 mm. 



The swimbladder lies well back in the body cavity, the posterior end being above the base of the 

 pelvic fins and immediately in front of the bulbous part of the kidneys. In the 31 -mm. fish the organ 





