Contribution à l'étude des cumaces de profondeur de l'atlantique nord : le genre Makrokylindrus Stebbing)

The genus Makrokylindrus Stebbing, 1912, is characteristic of deep waters, since, out of the 32 species know to this day, only two, M. serricaudata (Scott, 1912) and M. fistularis (Calman, 1911), have been collected at depths of less than 200 m. The study of collections from previous cruises in the North Atlantic Ocean enabled us to identify some of the 11 species already known in this area and to complete the inventory of this genus by describing 7 new species. The studied material comes from the following cruises: - Noratlante cruise (R.S. "Jean Charcot", August-September-October 1969) of the Brittany Oceanology Centre (NOR). - cruises by H. L. Sanders (Woods Hole Oceanographic Institution) on board the "Gay Head- Bermuda transect", 1960-1969 (BER). - cruise of the "Sarsia" in the Bay of Biscay, July 1967, (GAS). - cruise of the "Discovery" in the Canaries, March 1968 (CAN).