French black and white film called something like ltlantique?

You're likely thinking of "L'Atlantide" (1932), a French fantasy film directed by Jacques Feyder.

Here's why it fits your description:

* Black and White: "L'Atlantide" was indeed filmed in black and white.

* French: It was a French production.

* Title Similar to "Atlantique": The title "L'Atlantide" translates to "Atlantis" in English.

Let me know if you have any other details about the film that might help narrow it down further.