Arkell.1956.Jurassic..

PLATE 44
UPPER TITHONIAN
1. Berriasella calisto (d'Orbigny), topotype, after Mazenot (1939, pi. iv, fig. 12),
Berriasian, Apremont. The species also occurs in the Upper Tithonian.
X i-o.
2. Berriasella privasensis (Pictet), lectotype designated by Mazenot, 1939, after
Mazenot (1939, pi. ii, fig. 3), Berriasian, Berrias. The species also occurs
in the Upper Tithonian. Type species of the genus Berriasella Uhlig, 1905,
designated by Roman, 1938. Xi-o.
3. Berriasella delphinensis (Kilian), holotype, after Mazenot (1939, pi. vi, fig. 15).
Upper Tithonian, Claps-de-Luc. X 1 -o.
4. Protacanthodiscus chaperi (Pictet), lectotype designated by Mazenot, 1939,
after Mazenot (1939, pi. viii, fig. 7). Upper Tithonian, Aizy. Xi-o.
5. Virgatosphinctes transitorius (Oppel), lectotype now designated, after Zittel,
1868, pi. 22, fig. 1. Upper Tithonian, Stramberg. Xo-5s.
786
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