Fig. 103. Amplexus in the toad, Bufo fowleri. (Modified from Rugh: The Frog, Its 

 Reproduction and Development, Philadelphia, Blakiston, 1951.) 



^^g34C<.<A,dii^&h.i ^ V , ^ 



ANAL FIN OF MALE 



-CLOACA 



N TROMI TTEN 

 ORGAN 



CUT MUSCLE 



GROOVE FOR 

 SPERM PASSAGE 



N UPPER SUR FACE 

 F INTROMITTENT 

 ORGAN 



Fig. 104. Modifications of the fins of male fishes with the resulting elaboration of an 

 intromittent organ. (A) Gambusia affinis. (B) Ventral view of pelvic fins of Squalus 

 acanthias. (C) Dorsal view of left fin to show genital groove in intromittent structure. 



185 



