Ill 



AIR-BLADDEE 



167 



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

 A, Kkodeus, 5 mm., longitudinal section;, B, Rhodeits, 6 mm., longitudinal section; C, Rliodeus, 

 7 mrn., transverse section, showing small pouch-like outgrowth of pneumatic duct; end, endoderm; ent, 

 enteric cavity; I, air-bladder; li, liver; A r , notoohord ; no, pronephric chamber; p.d, pneumatic 

 duct y, yolk. , , 



