Rufus Richard Humphrey

• A modification of the urodele testis resulting from germ-cell degeneration
• Extirpation of the primordial germ cells of Amblystoma
• Ovulation in the four-toed salamander, Hemidactylium scutatum
• Sex differentiation in gonads developed from transplants of the intermediate mesoderm of Amblystoma
• The multiple testis in urodeles