Ill 



167 



FIG. 93. Development of the air-bladder of a Teleost. (After Moser, 1904.) 

 A. Hlnitli'.ns, 5 mm., longitudinal section; B, Rhodeus, 6 mm., longitudinal section; C, Rhodeus, 

 7 nun., transverse section, showing small pourh-liko outgrowth of pneumatic duct; end, endoderm; ent, 

 enteric cavity; I, air-bladder; //. liver; .V, notochonl : /. pionephric chamber; /.(/, pneumatic 

 duct >/, yolk. 



