We start with the DIX marque, which changed hands a number of times. The early DIX cards date from the Piprot era around 1914. Some have the Chambre Syndicale
crest (Piprot was a member and long term vice-president). A few low-number ones are sepia reproductions of Salon pictures, but the marque was quickly dominated by first world war patriotic cards, mainly on the theme of separation. After the visé regulations came in, many of the cards mention "Tirage G Piprot..", others "Établissements Photographiques de Boulogne-sur-Seine".
The successor to Piprot was E.David, see the 1918 Bottin entry. There are cards which carry E David's name without a DIX logo, presumably earlier ones.
A. Monod, successor to E. David & G Piprot, had three entries in the 1921 Bottin, a text enty and a display entry for Éditions Lafayette and a display entry for Monod.
Perhaps Éditions Lafayette was formed when the succession took place.
By this time DIX cards are typically romantic ladies, couples and children.
Éditions Lafayette started with the marques Dix, Opéra, Diane, Idole. The 1928 entry adds the marques E.L.F. and Fleurette.
E.L.F. cards are erotic semi-nudes. The only Fleurette card I have seen was a greetings card.
The mention of Bijou is perhaps referring to a type of card rather than the Bijou marque.