What is the difference between Marsupials and Placentals?

Marasupials:

1. They are pouched mammals.

2. Epipubic bones are present.

3. Vaginae or uteri are double.

4. Corpus callosum is less developed.e.g. macropus Didelphis.

Placentale:

1. They are placental mammals.

2. Epipubic bones are absent.

3. Vagina is single.

4. Corpus callosum is well developed. E.g. bat, whale, cat, humans.