Prorastomus

Prorastomus sirenoides (meaning "broad jaws at the front."[1]) is an extinct species of primitive sirenian that lived during the Eocene Epoch 40 million years ago in Jamaica.

Description
While modern sirenians are fully aquatic, the 1.5 metres (5 ft) Prorastomus was predominantly terrestrial, judging from the structure of its skull. Judging from its crown-shaped molars and the shape of its snout, it fed on soft plants.