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A N A T I > M V AND PHYSIOLOGY OF 



mate above the plastron where it meets the upper shield, while at the middle line 

 of the body the origins are separated by the distance of the eighth from the third 

 vertebra. The fibres composing the anterior belly are close and firm for the outer 



Fie. 3. 



Fig. 3. Muscles of inspiration anil expiration. — a •' " > ', margin of carapace; 1 1', portion of plastron in position ; 

 c, post. Tin r belly of the expiratory muscle on the right side ; d d', anterior bellies of the expiratory muscle ; e, 

 reticulated portion showing the lung beneath ; fj '. inspiratory muscle of the left side ; f", central tendon ; / '", 

 tendinous ligament ; g g', tendon of expiratory muscle ; A, muscular fibres beneath the tendon g g', ami attache,! 

 to the lung. 



