Download PDF by Ronchadzé J.: Perisphinctes de l’Argovien de Chézery et de la Faucille

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B . der Ammonitengattung Perisphinctes, p. 273). En ré11lité ces deux espèces doivent être maintenues séparées et elles n'ont �ême pas, très proba­ blement, de parenté directe. ro est une. forme beaucoup plus évolute que P. , avec des tours moins élevés, et pourvue de constrictions non obliques. A mon avis, P. kreutzi Siem occupe une position intermédiaire entre les formes du sous-groupe du P. plicaiilis et celles du sous-groupe d u P. jelski. Il ressemble d'une pa�t à P. lucingensis et d'autre part il se rattache étroitement à P.

50, Pl. IV, �g. 5) et, dans sa monographie du genre Perisphinctes, il en a défini une variété nommée P. ameas v. plana. J·e ne puis rapporter au P. œneas (var. nt en nO côtes environ par tour, réguli èr·e ment bifurquées, peu obliques en avant, droites, saillantes et espacées. Les côtes simples sont rares et les côtes trifurqu ées n'appa­ raissent qu 'en arrière des constrictions, qu i sont au nombr·e de deux à quatre par tour et p ersiste nt jusqu'ail dernier tour, sur lequel on voit des traces bien nettes de nœuds paraboliques.

Et P. elisabethtB de Riaz. Je me demande même si parmi les éch3jntil­ lons attribués à P. occulte{urcatus Waag je n'ai pas desformes hybrides. S! l 'on examine les jeunes individus, d'un diamètre inférieur à 2Qmm, on voit qu'ils présentent les mêmes traits caractéristiques que P. elisabethée. L'ornementa-: tion consiste en des côtes fines, droites, serrées, peu obliques en avant c� gui se divisent vers le tiers externe des flancs en deux côtes siphona� es plus fines encore. SIE�lRADSKI 32 P F. R I S P H I NT H S DE L' A RG OV I E N DH C H ÉZERY La bifurcation n'est pas tout à fait réguli ère ; des côtes trifurq u ées apparaissent eo arr iè re des constrictions, qui sont au nombre de 4 à 5 p a r tour ; q u e l q ue s côtes sont simp les.

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Perisphinctes de l’Argovien de Chézery et de la Faucille by Ronchadzé J.


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