130 



THE AMEBIC AX XA TURALIST [Vol. LIII 



ties, and Whiting (1916) lias stated that the non-yellow 

 factor has been found in some animals. 



In conclusion it may be said that we have furnished 

 one more proof of the fact that the phenotypic appear- 

 ance of an animal may entirely mislead one as to its 

 gametic composition. The synthetic pink-eyed self white 

 guinea-pig may also serve another purpose. By proper 

 matings an animal can bo produced which carries all the 

 known recessive color factors in guinea-pigs except al- 

 binism, and animals of this type should be most useful 

 in determining the possible linkage relations between 

 the factors. 



LITEEATUEE CITED 



Castle, W. E. 



1905. Heredity of coat characters in guinea-pigs and rabbits. Carnegie 



Institution of Washington, Publication No. 23, 78 pp. 5 pis. 

 1914. Some new varieties of rats and guinea-pigs and their relation to 

 problems of color inheritance. Ameu. Nat., Vol. 48, pp. 65-73. 

 Castle, W. E., and Sewall Wright. 



1916. Studies of inheritance in guinea-pigs and rats. Carnegie Insti- 

 tution of Washington, Publication No. 241, 192 pp. 

 Detlefsen, J. A. 



Ibsen, H. L. ' 



1916. Tricolor inheritance. I. The tricolor series in guinea-pigs. 

 Genetics, Vol. 1, pp. 287-309. 

 Sturtevant, A. H. 



1913. The Himala^-an rabbit case with some considerations on multiple 

 allelomorphs. Amer. Nat., Vol. 47, pp. 234-238. 

 Whiting, P. W. 



1916. A new color variety of the Norway rat. Science, N. S., Vol. 43, 

 p. 781. 



