Mammæ, rudimentary, [451].
Mammals, fossil, in secondary formation, [304].
——, insular, [394].
Man, origin of races of, [199].
Manatee, rudimentary nails of, [454].
Marsupials of Australia, [116].
——, fossil species of, [339].
Martens, M., experiment on seeds, [360].
Martin, Mr. W. C., on striped mules, [165].
Matteucci on the electric organs of rays, [193].