186 INDEX GENERUM MAMMALIUM. 
Genera and subgenera are treated alike, and entries showing when 
subgenera were raised to full generic rank have been omitted. But 
families and subfamilies have been carefully distinguished, and when 
a subfamily has been raised to the rank of a full family both names 
are given. Misprints, emendations, and variants in generic names are 
included only when they have a different initial letter or differ radi- 
cally in spelling. If, however, the original form of either a family or 
subfafnily name differs from the form now accepted both are mentioned. 
'This may necessitate three distinct entries (asin the case of Natalinia, 
1866; Nataline, 1892; and Natalidz, 1899), but giving all the impor- 
tant forms facilities tracing the history of the name. Later refer- 
ences are in all cases indented. 
