Rendiconti delle sedute della Reale Accademia dei Lincei (3)1: 611-630. 3 pls.

–Concludes that the atlas of Pachyacanthus cannot be referred to a mysticete or a sirenian but most closely resembles that of a river dolphin (Platanistidae sensu lato). Compares the atlas of Pachyacanthus with those of Halitherium schinzii, Felsinotherium forestii, Manatus, Halicore, and other cetaceans, with figures in pl. 3.