Hay — Further Observations on Same Extinct Elephants. 101 



Elephas rooseveiti, new species. 



Type specimen. Upper and lower hindermost molars, No. 2195, U. S. 

 National Museum. 



Type locality. Ashland, Cass County, Illinois. 



Type formation. Pleistocene. 



Difigno.ns. Hindermost molars long and low, the base and the summit 



approximately parallel, consisting apparently of 25 

 plates; of these 8 in a 100 mm. line; enamel thin, deli- 

 cate, and little folded. 



The Ashland teeth are chosen because with them came the nearly com- 

 plete lower right hindermost molar. The length of the molars is close to 

 300 mm, the height 170 mm, the width of the upper teeth 90 mm., of the 

 lower 85 mm. 



It appears to the writer that one may justly object to the 

 nomenclature applied by Professor Osborn to some of his sub- 

 famiUes. It is generally recognized that the name of the family 

 and that of the subfamily are to be based on a type genus. 

 Examples of Professor Osborn's deviation from this wholesome 

 rule are found in his paper of 1921 (Amer. Mus. Novitates 

 No. 1). Rhynchorostrinae is used instead of Rhynchotheriinae, 

 Longirostrinae instead of Gomphotheriinae, Brevirostrinae 

 instead of Anancinae, and Mastodontinae instead of Mam- 

 mutinae; while the Mammontinae appear to include no genus 

 except Elephas. It is a singular fact that Professor Osborn 

 on the same page arranges the genus Elephas under two sub- 

 famihes. In case the mammoths are worthy of subfamily rank, 

 to be called Mammontinae, there ought to be a corresponding 

 genus, but so far as the writer knows no such genus has yet 

 been proposed. 



