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


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

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6-9. I h i d . , p . 383, pl. 15, fig. 10-12. I d . Rrodiceras 1-eflectans Sciirn~itoi~. :> id. L u d w i g i a patens SC~IIRAHD~N. I b i d . , p. 386, pl. 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.

Certains auteurs, tels que I-Iyatt, Buckman et Bonarelli, ont proposé quelclues-uns de ces sous-genres, qui ne paraissent pas englober l'ensemble de ces Cæloceratidés. Nous n'essaierons pas de faire cette distribution en sous-genres, ce qui nous conduirait à fusionner certains sous-genres admis et à en introduire d'autres. Nous nous contenterons, pour ces Czloceratidés du Toarcien moyen, de les comprendre tous sous le nom dt: Czloceras, en inrliquarit, entre parenthkses, pour certaines espèces, les noms de sous-genres admis par les auteurs et, pour les espèces nouvelles, au cas où, par une analogie ou ressemblaiice évidente, nous ne pourrions pas indiquer le iioin d'un sous-genre caractéristique, nous les désigiierons simplement sous le nom gknérique de Czloceras.

Sp. P l . 1, fig. 36, 31, 39 e t 40 e t Pl. IX, fig. 5 . Diagnose. ,avec parfois u n e interruption médiane de ces côtes donnant lin aspect de rainiire longitudinale, ou parfois une saillie médiane donnant un aspect de véritable carène. La ligne des lobes, peu visible dans nos échantillons, inanifeste seulement un lohe siphoiial p o f o n d , forteriieiit denticulé, e t une selle externe à d e u x divisions très irrégulières. Rapports e t différences. - Peronoceras Krurr~beckinov. sp. rappelle par le disposi; mais il s'en distingue par ses tours tif (le ses côtes latérales Porpoceras vol-ticellirrn S~JIPSON hieii plus compririiés et surtout par le dispositif d e s côtes d u pourtour externe, qui est très irrégulier et présente les traits sigiialés d e 1:t dernière loge d e Czloceras m u c r o n a t u m OR^.

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Ammonites rares ou peu connues et ammonites nouvelles du Toarcien moyen de la région Sud-Est de l'Aveyron by Monestier J.

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