550 ~ RODENTIA 



by the presence of premolars, the cross-ridged pattern of the 

 enamel folding of the cheek-teeth and the peculiar secondary 

 angulation of the angular process of the lower jaw. 



KEY TO THE EUROPEAN GENERA OF MUSCARDINID.i:. 



Outer margin of first and second upper molar with 

 two high cusps (occasionally one or two others 

 low and obsolete). 

 Cro\vns of cheek-teeth deeply concave ; premolar 

 both above and below noticeably cuspidate ; 

 tail not uniformly haired, the basal half 

 terete, the terminal portion slightly flattened Eliomys, p. 550. 

 Crowns of cheek-teeth slightly concave ; premolar 

 both above and below not noticeably cuspidate ; 

 tail uniformly haired, moderately distichous... Dyromys, p. 56G. 

 Outer margin of crown of first and second upper 

 molar with five or six low cusps. 

 Crowns of cheek-teeth very slightly concave ; first 

 and second upper molars essentially alike in 

 form and in arrangement of cross-ridges ; tail 



conspicuously distichous Glis, p. 572. 



Crowns of cheek-teeth flat ; first and second upper 

 molars conspicuously unlike in form and in 

 arrangement of cross-ridges ; tail not evidently 

 distichous Muscarclinus, p. 583. 



Genus ELIOMYS Wagner. 



1843. Eliomys Wagner, Abhandl. k. Bayer, Akad. Wissensch. Miinchen, 

 Math.-Phys. CI., iii, p. 176 (Sub-genus of Myoxus). 



1857. Eliomys Blasius, Saugethiere Deutschlands, p. 289 (Sub-genus of 

 Myoxus) part. 



1890. Eliomys Reuvens, Die Myoxidae oder Schlaefer, p. 22 (Sub-genus of 

 Myoxus) part. 



Tjipe species. — -Eliomys melanurus Wagner. 



Geographical disfrihution. — Europe from the Atlantic coast 

 eastward into Asia Minor, and from northern Germany (Mecklen- 

 burg) south into northern Africa. 



Characters. — Skull deep, smooth and rounded, without evident 

 ridges or depressions in interorbital region ; brain-case deep, the 

 auditory bullte large : ectopterygoid well developed ; jugal short 

 anteriorl3% not approaching lachrymal ; mandible with angular 

 portion fenestrate ; dental formula : / J]J, pm ^ J, m -j^-j = 20 ; 

 crowns of cheek-teeth deeply concave laterally, the inner and 

 outer margins noticeably elevated, the outer margin of each 

 maxillary tooth with two high cusps (one or two others low and 

 inconspicuous sometimes present) ; crown of rii^ and m- with live 

 transverse ridges, of which the third is incomplete ; tail not 

 uniformly haired throughout, the basal half terete, the terminal 

 portion slightly flattened. 



Remarks. — The genus Eliomijs as now understood contains 



