Welcome to the GMB, jimbob.
As your query is an ID request, I think it should probably have been posted in the main Glass section (identification requests), but it can always be moved by the moderators if needs be. This section is really for listing details of registered designs prior to detailed searches being made for their registry details and design representations at The National Archives at Kew (presently via the kind offices of GMB member Paul Stirling).
Jules Lang & Son registered design number 799042 on 31 Dec 1934.
Posting a photo of an item for ID is always helpful, but I presume your piece is like the example in my photos below (clicking on a photo thumbnail should enlarge it) – an oval footed bowl in clear pressed glass, the ‘ends’ of the bowl having exterior sockets into which fit small trumpet-shaped epergnes . Most probably meant to be a decorative table centrepiece, the epergnes to hold posies of flowers and main bowl to hold an arrangement of flowers of perhaps fruit.
The design registrants were London-based, but were importers and agents of glassware, some of which was manufactured in their own French glassworks and the rest most likely made under licence elsewhere in Europe.
Fred.