Les ammonites pyriteuses du Tithonique supérieur et du by Mme S. Arnould-Saget

By Mme S. Arnould-Saget

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Les flancs sont plats et un peu convergents vers l'extérieur. La région ventrale est étroite, occupée par un méplat de largeur moyenne. Le rebord ombilical est arrondi. La muraille est courte, mais abrupte. Les côtes sont fortes, tranchantes, droites et proverses. Elles se divisent à mi-flanc, l'une d'entre elles au quart de sa course, en deux côtes secondaires infléchies vers l'avant et qui s'interrompent de chaque côté du méplat siphonal, après s'être renflées en massue allongée. Elles sont effacées à leur naissance et le point de bifurcation en paraît d'autant plus saillant.

662. Tnon 5. 1890 Hoplites Calisto var. Oppeli TOUCAS Ardèche [ 7 6 ] , p. 601. 1919 Berriasella Oppeli BURCKHARDT Symon [ 1 1 ] , p. 56, pl. X I X , fig. 5-7. 1937 Berriasella Oppeli BREISTROFFER Tith. pyr. Tunisie [ 7 ] , p. 19. 1939 Berriasella Oppeli MAZENOT Pahehoplitidse [ 4 6 ] , p. 49-51, pl. III, fig. l a b c , [2 a b c, 3 a b, 4 a b, 5 a b, 6 a b, 7 a b, 8 a b c. 71 I. Stramberg, HOLOTYPE (81). p. 100, pl. XX, fig. 1 abc. 66 II. Dj. Kralif, pl. III, tiq. l a b c . 64 III. Dj. Kralif, pl.

Stramberg, (81). p. 107, pl. 66 HOLOTYPF. XVIII, fig. 4. 34) II. Dj. Kralif, pl. V, fig. 5 a b c . DIAGNOSE ORIGINALE La diagnose de ZITTEL est succincte. la surface de la coquille est couverte de côtes nombreuses (50 sur chaque tour) et serrées, qui commencent à la suture et se divisent en majeure partie en deux branches. Cette bifurcation débute à une hauteur très inégale, en général vers le milieu, mais pour certaines beaucoup plus bas. Çà et là, deux côtes naissent en un même point et se divisent ensuite plus loin.

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