IO 



BERTRAM G. SMITH. 



Breathing Movements . — The process of breathing by means 

 of the lungs has been briefly described by Reese ('03) ; the fol- 

 lowing details may be added. In rising for air the anterior end 

 of the body is stretched slowly in an oblique direction upward ; 



Fig. 2. 



Fig. 3. 



Fig. 4. 



Figs. 2-4. An adult female Cryptobranchus allegheniensis, 53 cm. in length. This 

 specimen, full grown when captured, has been kept for seven years in an aquarium 

 in the Zoological Laboratory of the University of Michigan. It is a trifle slender as 

 compared with most newly- captured specimens. The white spots on the back are 

 due to a recent growth of Saprolegnia. 



Fig. 2. Normal resting position. 



Fig. 3. Attitude when about to rise for air. 



Fig. 4. .Attitude when the lungs are fully inflated. 



