Alvania peyreirensis Cossmann & Peyrot, 1919 † (original description)
Alvania raulini Cossmann & Peyrot, 1919 † (original description)
Bythinella bearnensis Cossmann & Peyrot, 1919 † (original description)
Bythinella falloti Degrange-Touzin, 1892 † accepted as Stenothyroides falloti (Degrange-Touzin, 1892) † (basis of record)
Cingula vera Cossmann & Peyrot, 1919 † (original description)
Hydrobia (Amnicola) leognanensis Cossmann & Peyrot, 1919 † accepted as Pseudamnicola leognanensis (Cossmann & Peyrot, 1919) † (original description)
Hydrobia (Peringia) cestasensis Cossmann & Peyrot, 1919 † represented as Hydrobia cestasensis Cossmann & Peyrot, 1919 † (original description)
Hydrobia (Peringia) sacyi Cossmann & Peyrot, 1919 † represented as Hydrobia sacyi Cossmann & Peyrot, 1919 † (original description)
Hydrobia girondica O. Boettger, 1892 † (additional source)
Hydrobia ventrosa var. polysarca Cossmann & Peyrot, 1919 † accepted as Ecrobia ventrosa var. polysarca (Cossmann & Peyrot, 1919) † (original description)
Melania (Eumelania) aquitanica Noulet, 1846 † accepted as Tinnyea aquitanica (Noulet, 1846) † (basis of record)
Melania (Eumelania) aquitanica var. perproxima Cossmann & Peyrot, 1919 † accepted as Melania aquitanica Noulet, 1846 † accepted as Tinnyea aquitanica (Noulet, 1846) † (original description)
Melanopsis aquensis Grateloup, 1838 † (additional source)
Melanopsis nereis A. d'Orbigny, 1852 † (additional source)
Neritina (Smaragdia) Issel, 1869 accepted as Smaragdia Issel, 1869 (basis of record)
Neritina (Smaragdia) merignacensis Cossmann & Peyrot, 1918 † accepted as Smaragdia merignacensis (Cossmann & Peyrot, 1918) † (original description)
Nystia cylindrica Cossmann & Peyrot, 1919 † accepted as Bouryia cylindrica (Cossmann & Peyrot, 1919) † (original description)
Nystia degrangei Cossmann & Peyrot, 1919 † (original description)
Rissoina (Rissolina) aturensis Cossmann & Peyrot, 1919 † represented as Rissoina aturensis Cossmann & Peyrot, 1919 † (original description)
Rissoina bearnensis Cossmann & Peyrot, 1919 † (original description)
Rissoina bistriata (Grateloup, 1847) † (source of synonymy)
Rissoina elongata f. mancietensis Cossmann & Peyrot, 1919 † accepted as Rissoina mancietensis Cossmann & Peyrot, 1919 † (original description)
Rissoina elongata var. scalarata Cossmann & Peyrot, 1919 † accepted as Rissoina scalarata Cossmann & Peyrot, 1919 † (original description)
Rissoina emiliae Cossmann & Peyrot, 1919 † (original description)
Rissoina exdecussata Sacco, 1895 † (status source)
Rissoina scalarata Cossmann & Peyrot, 1919 † (original description)
Rissoina syrtica Cossmann & Peyrot, 1919 † (original description)
Stenothyra aquitanica Cossmann & Peyrot, 1919 † accepted as Stenothyroides aquitanica (Cossmann & Peyrot, 1919) † (original description)
Syrnola subumbilicata (Grateloup, 1838) † (additional source)
Tinostoma (Megatyloma) Cossmann, 1888 † accepted as Megatyloma Cossmann, 1888 † (basis of record)
Tinostoma (Megatyloma) neritinoides Cossmann & Peyrot, 1918 † accepted as Neritilia neritinoides (Cossmann & Peyrot, 1918) † (original description)
Turbella degrangei Cossmann & Peyrot, 1919 † accepted as Turboella degrangei Cossmann & Peyrot, 1919 † accepted as Rissoa degrangei (Cossmann & Peyrot, 1919) † (original description)