Arkell.1956.Jurassic..

i 78 THE ALPS AND NORTHERN CARPATHIANS
back to the type species. The classification of the Hildoceratidae is also
in an unsatisfactory state.
For the Toarcian and Pliensbachian reference should be made to
Bettoni (1900), Bonarelli (1894, 1895), Ceretta (1938), Cita (1947), Desio
& Airaghi (1934), Fucini (1908), Gregorio (1885), Haas (1913, 1951),
Hauer (1861), Lepori (1942), Meneghini (1867-81), Mitzopoulos (1932),
Mitzopoulos & Renz (1929), Negri (1934-6), Parona (1892), Renz (1922,
1925, 19256, 1927), Taramelli (1880), Tausch (1890), Toni (1911-12),
Vecchia (1949), Venzo (1952 and monographs in the press).
For the Sinemurian and Hettangian important works are those by
Alessandri (1903), Boehm (1884), Bonarelli (1894), Ceretta (1938), Negri
(1934-6), Parona (1896-8), Taramelli (1880), Vecchia (1945, 1948, 1949).
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