132 GENETIC STUDIES ON A CAVY SPECIES CROSS. 



Thomas, O. 



1901 On mammals obtained by Mr. Alphonse Robert on the Rio Jordao, S. A., 

 Minas Geraea. Ann. and Mag. Nat. Hist., London, vol. 8, No. 49, 

 pp. 52&-539. 



DE VKrE8,'H. , 



1906. Species and varieties, their origin by mutation. Chicago, Open Court 



Publ. Co. XVIII + 847 pp. 



Waldow von Wahl, H. 



1907. Fruchtbare Maultiere. Jahrb. f. wissensch. and prakt.T iersucht, vol. 2, 



pp. LI-LIV, 1 pi. 



Watkrhouse, G. R. 



1848 A natural history of the mammalia. London, H. Bailliere. Vol. II, 500 

 pp., 21 pi. 



