4° 



DISCOVERY REPORTS 



covered by the gas-gland. This has three lobes, each receiving a rete mirabile. The retia originate in 

 front of the sac, and are bound together to form a cylindrical structure, before diverging over the 

 under surface of the gas-gland. The left, middle and right retia have lengths of about 2-5, 3-0 and 

 4-0 mm. respectively, differences parallel to those found in Lampadena chavesi. 



ra 



rv 



Text-fig. 22. Swimbladders of Lampanyctus gnentheri (a) lateral view of anterior half, and L. alatus (b), ventral view of 

 anterior half, gg, gas-gland ; op, opening of oval into main cavity of swimbladder ; ov, oval ; ra, retial artery ; rv, retial vein ; 

 rm, rete mirabile. (a, x 27; B, x 22-5.) 



Lampanyctus pusillus (Johnson) 



St. 1602, 17° 59-9' S., 04° 27-1' E., 27. x. 35, TYFB, i7s(-o)m. B.M. Reg. no. 1948.5.14. 389-91. Standard 

 length 22 mm. (3-0 x 0-5 mm.). 



St. 100 C, 33 20-33 46' S., 15° 18' -15° 08' E. 4. x. 26, TYF, 25oo-20oo(-o) m. B.M. Reg. no. 1930.1.12. 

 762-3. Standard length 33 mm. (6-5 x 1-5 mm.). 



The swimbladder of this species lies over the posterior half of the stomach and extends beyond it 

 as far as the level of insertion of the pelvic fins. In both specimens the sac is considerably relaxed. 



The retia mirabilia originate to the left of the anterior tip of the swimbladder and extend back- 

 wards to the gas-gland, which covers the forward part of the floor. Close examination of the 3 3 -mm. 

 fish revealed that each rete has a different length. The inner one supplies an anterior lobe of the gas- 

 gland, the middle one a middle lobe and the outer one a posterior lobe. Their lengths in the order 

 given are 3-0, 2-3 and i-8 mm. 



An oval is present on the roof of the sac above the forward part of the retia. 



