52 



INTRODUCTION. 



And finally, attention must be drawn to a pro- 

 blematic organ, peculiar to the males of the genus 

 Bufo, termed by Spengel " Bidder's organ," situated 



Fig. 22. 



r.< 



ca 



TS- 



CCb 



M/ 



B 



D E 



Right urogenital apparatus (ventral view, the testis shifted to 

 the side) of- — A. Discoglossus pictus. b. Bombinator pachypus. 

 c. Alytes obstetricans. D. Bnfa viridis. e. Rana temporaria. 



b. Bidder's organ. 

 ca. Corpora adiposa. 

 m Miillenan duct. 



r. Kidney. 



t. Testis. 



u. Ureter. 

 ve. Vas efferens. 

 vs. Vesicula seniinis. 



