Eduardo,
 
Your questios:
 
>1) What is the year Calliostoma zizyphinum va. conuloides (Lamarck, ****)
>was described?
 
Trochus conuloides Lamarck, 1822
 
>2) What is the valid name: Lunatia catena (da Costa, 1778), as in Gert
>Lindner's book or Polinices catena (da Costa, 1778), as in Abbott's
>Compendium?
 
Current name: Euspira catena (Da Costa,1778)
 
>3) Is Lunatia nitida (Donovan, 1804) a valid specie?
 
yes is a valid one
 
                -       Euspira nitida (Donovan,1804) [Nerita]
                        =       alderi (Forbes,1838) [Natica]
                        =       elata (B.D.D.,1883) [Natica] alderi var.
                        =       glaucina sensu (Maravigna,1838) [Natica]
non (Linné,1758) [Nerita]
                        =       globulosa (B.D.D.,1883) [Natica] alderi var.
                        =       intermedia (Philippi,1836) non
(Deshayes,1832) [Natica]
                        =       lactea (Jeffreys,1867) [Natica] alderi var.
                        =       marochiensis sensu (Philippi,1844) [Natica]
non (Gmelin,1791) [Nerita]
                        =       parvula (Tapparone Canefri,1869) [Natica]
                        =       poliana (Delle Chiaje,1827) [Natica]
                        =       pulchella (Risso,1826) [Natica]
                        =       subovalis (Jeffreys,1867) [Natica] alderi var.
                        =       ventricosa (Jeffreys,1867) [Natica] alderi var.
 
 
 
 
>4) What is the valid name: Capulus hungaricus (Linnaeus, 1767), as in Gert
>Lindner's book or Capulus ungaricus (Linnaeus, 1767), as in Abbott's
>Compendium?
 
Capulus ungaricus (Linné,1758) [Patella]
 
Ciao from Italy
 
Riccardo Giannuzzi-Savelli