SIWALIK AND NARBADA PROBOSCIDIA. 
113—294 
Mastodon dissimilis, Jourdan. 
The text of MM. Lortet and Chantre's monograph on the Mastodons of the Rhine basin, 
alluded to on pages 2.86 and 290, has just been received in India : from this memoir I find 
that M. dissimilis is merely a synonym of M. arvernensis, and not a distinct species. The name 
dissimilis is a manuscript one proposed by the late M. Jourdan in 1840 for specimens in the 
Lyons museum. The name of M. arvernensis was applied by Croizet and Jobert in 1826, and has 
always been recognized ^by subsequent writers. I cannot but think it extremely ill-advised to rake 
up an utterly forgotten name for a well known species, and still more so to publish the plates under 
that name without the explanatory text. 
March 1880. 
