PLATE II 



Microphotographs of parts of the swimbladder, taken from sections 

 (figs. 1-3, transverse section; fig. 4 longitudinal section). 



Fig. 1. Giant cell of gas-gland of Vinciguerria attenuata ( x 675). Note 

 the intracellular capillaries, surrounded by lighter staining peri- 

 capillary cytoplasm and the fine canals joining the capillaries. The 

 vacuolated nature of the pericapillary cytoplasm can also be seen. 

 b = base of cell. 



Fig. 2. Much enlarged part (X1500) of a giant gas-gland cell of 

 Vinciguerria attenuata to show the vacuolated nature of the cyto- 

 plasm surrounding the capillaries. 



Fig. 3. Appearance of part of the gas-gland in a compressed swim- 

 bladder of Vinciguerria nimbaria ( x 225). Note the very different 

 shape of the cells from the one shown in fig. 1 , which came from a 

 fully expanded swimbladder. The intracellular capillaries and peri- 

 capillary cytoplasm (here without vacuoles) may also be seen. 



Fig. 4. Entry of a rete into lobe of gas-gland of Myctophum punctatum 

 ( x 67 - 5). Note the parallel system of capillaries forming the rete 

 and the capillaries running among the gas-gland cells. 



