126 



GENERAL EMBRYOLOGY 



FIG. 71. Metamorphosis of the spermatic! of the guinea pig, Cavia cobaya. 

 After Meves. L. Side view, showing flattening of head, a, axial filament; 

 c, centrosomes (centrioles) ; e, neck, containing end knobs (proximal centriole) ; 

 k, chromidial "nebenkorper;" m, middle piece; n, nucleus; s, centrosphere (aero- 

 some) ; u, annulus (posterior portion distal centrosome) ; v, mitochondria (partly 

 becoming a portion of the tail envelope) ; y, cytoplasmic portion of spermatid, 

 being thrown off in K and L; in J, K, L containing mitochondrial remains. 



