Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 15. 1992. (Budapest, 1992)

are short and thick. There is a wide, V-shaped septalium. The socket is wide and deep. The teeth are thick and not crenulated, diverging from the dental plates. The median septum runs to the one-fifth of the length. The cross-section of the loop is widening gradually, crescentic in outline, then diminishing before disappearance. Most of the loop is missing. 0.5 Text-fig. 30 - Iransverse serial sections of Zeilleria alpina. Remarks: Zeilleria alpina is similar to the subpentagonal Z. mutabilis, differing by its circular-subcircular outline and smaller curvature of beak. Z. alpina was first described by Geyer (1889) but previously Canavari (1883) illustrated a specimen assignable to Z. alpina