In this article are presented some of the new discoveries from the French Rhaetic locality of Saint-Nicolas de Port. One of the teeth represents a new haramiyid characterized essentially by the shortness of the rows of tuber cules and the presence of a cusp anterior to the row A. Two "multituberculate" teeth constitute the first indication of this order in the Rhaetic. Finally, three specimens are considered as representing a new genus and species of Morganucodonta.
Brachyzostrodon coupatezi; this taxon is compared to all the other known morganucodonts. This small sample of the early Rhaetic mammalian fauna speaks in favor of a diversity within the first mammals well exceeding that imaginde until now.

Key words: Multituberculata, Haramiyides, Brachyzostrodon n . gen., Saint-Nicolas-de-Port, Rhetien.