with; modifications-; the nomenclature, how- 

 ever, is often different. ' The name of the 

 elass Mammalia/ says the author, ' is one of 

 the few names concerning which there is uni- 

 versal agreement.' After illustrating how 

 modern authorities differ in respect to the 

 names of even the primary divisions of the 

 elass, the author gives an outline of the classi- 

 fication and nomenclature here adopted, and 

 an explanation of his system of cross refer- 

 ences designed to facilitate the finding of any 

 desired name. 



This part of the work is especially impor- 

 tant, and amounts to, practically, a revision of 

 the nomenclature of the Mammalia, recent and 

 extinct. In respect to family names, the name 

 based on the earliest generic name has been 

 adopted when available, as when the genus on 

 which it is based is not antedated or preoccu- 

 pied. Under the family name are cited (1) 

 its synonyms and subfamilies, (2) its genera,, 

 with the author, date and type species of each. 

 Recent genera are distinguished from extinct 

 genera by the use of black-faced type for the 

 former and italic for the latter; preoccupied 

 names have a dagger (f) prefixed, but names 

 otherwise untenable appear not to be desig- 

 nated, except as shown by the context. 



The appendix adds 35 names discovered too 

 late to be included in Part I. These include 

 a few from Frisch (1775) and a considerable 

 number from Billberg (1828), and others pro- 

 posed during 1903. These early names are 

 fortunately merely nomina nuda, or synonyms, 

 or otherwise untenable. The appendix also 

 includes several pages of corrections, some of 

 them important, affecting the authorities for 

 a few genera given in Part I., and in one case 

 the orthography of a name, Tayassu G. Fischer 

 (1814) becoming Tagassu Frisch (1775), with 

 a corresponding change in the family name 

 based on this genus. 



It can not be supposed that a work of this 



