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. 



B 



E 



Right urogenital apparatus (ventral view, tlie testis sliifted to 

 the side) of — A. Disror/Iossuis p(V//(.9 b. Bomhinator ■pacliypiis. 

 c. Alytes obstetricans. D. Btifu riridis. E. Rana temporaria. 



h. Bidder's organ. 

 cu. Corpora adiposa. 

 m Millie ri an duet. 



1 . Kidney. 



t. Testis. 



11. Ureter. 

 ve. Vas effex-eus. 

 vs. Vesicula seminis. 



