490 



JEAN REDMAN OLIVER 



Mother centriole of spermatid 



Proximal centriole 



Distal centriole 



2 noduli anteriores 

 (possibly 3) 



Anterior portion 



Posterior portion 



2 noduli posteriores 

 Diagram 1 



Annulus 



A similar diagram, modified from Heidenhain ('07), repre- 

 senting the more complicated phenomena in the guinea-pig is 

 introduced for comparison (diagram 2). 



Mother centriole of spermatid 



Proximal centriole 



Distal (hook-shaped) centriole 

 / \ 



Horizontal Umb Vertical limb 



/ ^ ^ 



Anterior disc 3 noduli anteriores 3 noduli posteriores Nodule Annulus 



(disappears?) (middle one disappears) (disappears) 



Diagram 2 



Le Plat ('10) has described a much simpler condition for the 

 cat, which may be expressed by diagram 3. 



Mjther centriole of spermatid 



Proximal centriole 



Distal centriole 



2 noduli anteriores 



1 nodulus posterior Annulus 



Diagram 3 



