54 



R. R. HUMPHREY. 



CHART i. FIGS, i TO 14. Diagrams illustrating the origin and develop- 

 ment of the multiple testis of Desmognathus, up to a four-lobed stage. See 

 Tables I. and II. for average lengths of animals having testes of these 

 types. The cephalic end of the testis is at the right in all these figures. 

 Solid black represents regions occupied by primary or secondary sperma- 

 togonia. Unshaded areas are those occupied by later stages of the germ 

 cells spermatocytes I. to mature spermatozoa. Cross-hatched areas are 



