Fig. 238. Factors in Producing Hybrids Illustrated on Opposite Page 



(Three-fourths size) 

 1, Xiphophorus helleri (green), female; 2, Xiphophorus helleri (green), male; 

 3, Platypoecilus maculatus (rubra), male; 4, Platypoecilus maculatus (rubra), female; 

 5, Hybrid male from crossing Nos. 3 and 1; 6, Hybrid female from crossing Nos. 3 and 1; 

 7, Xiphophorus helleri (orange), male. 



Nos. 6 and 7 are the parents of hybrids shown in Fig. 239. All are live-bearing or 

 viviparous fishes. 



256 



