374 Bulletin American Museum of Natural History. [Vol. XVI, 



' Gattungen,' and to a large number of these, but as they are all 

 vernacular and not technical they do not require consideration 

 as an element in nomenclature. His ' Gattungen ' are for the 

 most part supergeneric groups, and in many cases conform to 

 modern families rather than to genera. But he subdivided his 

 ' Gattungen ' into groups, or sections, that correspond nearly 

 with the modern idea of genera. For these he adopted the 

 names already given to them by previous authors or, with few 

 exceptions, supplied new ones of his own, but left some under 

 merely vernacular names or without names. As an exposition 

 of this phase of the subject I subjoin his classification of the 

 order of Rodents, in the sequence employed in the ' Lehrbuch.' 

 This is not, however, the order in which the groups are given 

 in his ' Nahmen zu Okens Zoologie', II, pp. i-xi; (Mammals, 

 pp. ix-xi, Rodents, pp. ix, x) ; neither are the names and 

 groups always equivalent in the list of names and in the text. 

 The text was evidently put together carelessly, as in several 

 instances species of the same group are widely separated (see 

 Arctomys, pp. 837 .and 856), and there is apparently here and 

 there some duplication. 



II. ORDNUNG. Lurchsucke Pfoter. 

 i. Sippschaft. Froschpfoter Nager. 



i. Gattung. Hasen. 



i. Savia, Cavia. 



a. Hydrochaerus. 



b. Coelogenys. 



c. Dasyprocta. 



d. Cavia. 



1. Jaculus. 



a. Dipus. 



b. Pedetes. 



2. Murzer. 



a. Viscaccia. 



b. Arctomys. 



c. Bathyergus. 



d. Georychus. 



3. Krietsche. 



a. Citellus. 



b. Cricetus. 



2. Lepus. 



a. Lagomys. 



b. Lepus. 



2. Gattung. Bilche. 



c. Aspalax. 



d. Mus bursarius. 

 c. Tamias. 



4. Schwirrel. 



a. Sciurus. 



b. Pteromys. 



c. Glis. 



5. Pile. 



a. Loncheres. 



b. Mus spinosus. 



c. Coendu. 



