> I have a question about the family Trochidae.
> Is the genus GINEBIS Taki & Otuka, 1942, considered as valid at present?
>
> Or is it considered to be a synonym of BATHYBEMBIX Crosse, 1893?
> I have seen it listed as both, but I have no reference later than 1990.

If by 'valid' you mean taxonomically available, then yes it is; if you mean
'should I use it as a genus, or synonymise it with Bathybembix' then that's
up to you.
In taxonomical terms it was validly proposed, with Trochus argenteonitens
Lischke, 1872 as the type species. We (Higo, Callomon and Goto, 1999) treat
it as a separate genus from Bathybembix, as did Sakurai (1983) and Shikama
(1962), but you'll have to read the original article and make up your own
mind.