Bythinia lilliputiana Maillard, 1884 † accepted as Bithynia lilliputiana Maillard, 1884 † (original description)
Bythinia sautieri Maillard, 1884 † accepted as Bithynia sautieriana (de Loriol, 1865) † (original description)
Diplommoptychia Maillard, 1884 † (original description)
Diplommoptychia conulus Maillard, 1884 † (original description)
Diplommoptychia cylindrica Maillard, 1884 † (original description)
Megalomastoma bernense Maillard, 1884 † (original description)
Megalomastoma caroli Maillard, 1884 † (original description)
Megalomastoma loryi Maillard, 1884 † accepted as Loriolina loryana (de Loriol, 1865) † (original description)
Megalomastoma semisculptum Maillard, 1884 † (original description)
Melampus feurtillensis Maillard, 1884 † (original description)
Neritina wealdiensis Maillard, 1884 † accepted as Neritina veldiensis (F. A. Roemer, 1839) † (original description)
Physa wealdiensis Maillard, 1884 † accepted as Physa wealdiana Coquand, 1856 † (original description)
Succinea praecursor Maillard, 1884 † (original description)
Valvata sabaudiensis Maillard, 1884 † accepted as Provalvata sabaudiensis (Maillard, 1884) † (original description)