sigmoidea, Odostomia [ Strioturbonilla sigmoidea (Monterosato, 1880)] (Figures 28C, D)

1880c: 71 [XXVII: 555]—available name

Type material. MCZR –M–23717 —1 sh decollated + 1 sh “ O. (Pyrgulina) sigmoidea Monts n. sp. inedita Alger ( Joly)”.

Type locality. Described from Algiers (Algeria), Bay of Tangier (Morocco).

Remarks. Recorded by MolluscaBase (2018) as Strioturbonilla sigmoidea (Monterosato, 1880) .

spectabilis, Pyrgostelis [ Pyrgiscus spectabilis (Monterosato, 1884)] taxon inquirendum

1884h: 90 [XXXI: 746]—available name

Type material. Not found

Type locality. Described from Prèveza (Greece).

Remarks. Recorded by MolluscaBase (2018) as a synonym of Pyrgiscus rufus (Philippi, 1836) . However, Monterosato compared it with P. rufus for the coloration, but highlighted the diagnostic subsutural band, the less acute outline, the convex whorls, and the polished and transparent shell. We prefer to provisionally regard it as a nomen dubium [new status] since it may prove a distinct species, recalling Pyrgiscus abrardi (Fischer–Piette & Niclès, 1946).