26 DISCOVERY REPORTS 



posterior floor of the swimbladder. The left lobe of the gland is the larger, measuring about 6 mm. in 



length against the 4 mm. span of the right lobe. 



Borostomias antarcticus (Lonnberg) (Text-fig. 12 c) 



St. 114, 52 25' 00" S., 9 50' 00" E., 12. xi. 26, N 450, 650-70001. B.M. Reg. no. 1930.1.12. 474. Standard 

 length 167 mm. 



The swimbladder of this individual proved to be a tubular structure lying above the anterior part 

 of the stomach. It is club-shaped, measures about 13 mm. in length and contains a regressed gas- 

 gland and rete. An artery and vein run into the posterior part of the organ and can be traced back to 

 the backward section of the kidneys. Both the remains of the swimbladder and these blood-vessels 

 are surrounded by a layer of fatty tissue. 



Diplolychnus mononema Regan & Trewavas 

 Standard length 137 mm. 



No trace of a swimbladder could be found in this individual. 



B 



Text-fig. 13. Fat-invested swimbladders of Stomias affinis (a and a') and S. colubrimis (b). Lateral views, ft, fatty invest- 

 ment of swimbladder;^, gas-gland; oy, ovary; rm, rete mirabile ; rsb, regressed swimbladder. (a, X4"5; a', x 11-5; b, x 17-5.) 



Family Stomiatidae 



Stomias affinis Gunther (Text-fig. 13 a) 



St. 276, 5 54' 00" S., 11° 19' 00" E., 5. viii. 27, TYF, i5o(-o) m. B.M. Reg. no. 1930.1.12. 542-3. Standard 

 length 106 mm. 



In this individual there is a regressed swimbladder lying above the ovaries. Fatty tissue invests 

 the organ and is continued forwards and backwards into rod-like prolongations. The anterior one 

 extends to the front of the ovary, while the backward one, which is more slender and tapering, ends 

 rather more than half-way down the body-cavity. 



The length of the swimbladder is about 4-5 mm. Entering the posterior end is an artery and vein 

 supplying a club-shaped rete mirabila which is about 1-5 mm. in length. In the middle of the bladder 

 is a small gas-gland, o-8 mm. in length, which all but obliterates the lumen. Forward of the gland 

 there is no lumen, but merely a ' solid ' mass of connective tissue. 



