Ammonites rares ou peu connues et ammonites nouvelles du by Monestier J.

By Monestier J.

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Additional resources for Ammonites rares ou peu connues et ammonites nouvelles du Toarcien moyen de la région Sud-Est de l'Aveyron

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Dans u n premier stade, les tours sont à peu près lisses. Plus tard, ils prennent des côtes latérales sygmoïdes, arrondies, peu saillanles, généralement group&espar deux vers la hase, séparées par intervalles égaux à elles-riiêmes, effacées au voisinage de la carène. Dans la suite, ces côtes s'élargissent de plus en plus et prennent une allure falculifornie, proverse jusqu'au tiers de la hauteur des tours, se redressant brusquernent à ce niveau, puis s'incur- A3IISIONITES l)U SOARCIEN MOYEN 39 vant tlouceinent à l'avant, e n le haut des tours.

5. Largeur d'oicbilic 8 mm. Recouvrement 114. Cæloceras (Porpoceras) vorticellum Siarrsox. P l . 1, fig. 48, 50 e t 52. 1855. Arnr~ioriilesu o r l i c ~ l l r i sSIMI~SON. Yorkshire Lias, p. 61, i i O 81. i n BUCILM~IN. Yorksliire type Arnirioiiites, pl. 90. 1913. licellilrn SIRIPSOS . Diagnose. - La spire de cette Ariimonite est formée de tours assez évolutes, de section subquadratique, avec un pourtour exterrie u n peu déprimé, e t un ombilic assez ouvert. Ces tours sont pourvus latéralement de cî)tes assez saillantes, de directioii radiante, sél~nrées11ar iiitervalles doubles de leur largeur, la plupart terminées, au rebord exterlie, en pointes aigues s'appliquant sui.

15, fig. 19-21. '! id. s S c i ~ i r n ~ nI b~iid~. ,. p. 411, pl. 18, fig. 23-26. Diagnose. - Cette petite Amriionite, carénée e t d'ombilic moyen, a ses tours légèrement convexes en la partie siphonale, plats ou légèrement convexes sur les côtés, e t tombant s u r I'ombilic, en gradins arrondis, avec bande suturale. La partie ventrale est pourvue d'une quille pleine, mince e t peu saillante. Les cotes prennent naissance par groupe cle 2 e t 3 au rebord ombilical, en formant une sorte (le bourrelet élargi non saillant.

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