P8IL0CEB \> \M» I \I/m i. ''1 



M Collenot 1 mentions Am i Jal iqueum, and Burgund 



ourring in the Planorbis horizon. The collections ;it Semur show thai P 



small, and evidently already losing ground, whereas the fine Buites of calo- 

 oeran fossils indicate ;it least thai this series had Buffered no In-- 1 . \ migration 

 when compared with the buna of South Germany. This collection is also 

 ■Ranged t<> show a bed similar t<> tin* Laqueum layer of Quenstedt, called by 

 Collenot the "tone of .1". L . which contains only caloceran forms, and 



itinitm. (Jul. laqueum is smaller, and more like the German form 

 when found in company with / i* A t • • %% dwarfed forms of /'-</. planorbe, 

 we been found together at Saulieu, and at Beauregard there is a I n<l 

 with large forms of Cal. J accompanied by a larger form of Cal. 



• than i> usual in South Germany, and a Bmall PtU. planorbe, var. leve. The 

 latter is in Boucault's collection, Museum of Comparative Zoology, but not rep- 

 ted at the time of my visit in the collections at the Museum of Semur. The 

 M p. Cuvier are important in this connection. Hi -■ - that a 

 ible Planorbis bed was found by him on the Bection of the railway between 

 ire and Guillon, and immediately above tins a bed characterized by 

 the preset] ' I Again, on page 177. he >]><•: > k ~ ol finding at 



Ilea, near Saulieu, a bed containing Psil. planorbe and Cal. laqueum or B - 

 ith Collenot's observations, 

 Dumorl • • /' occurs everywhere in the Planorbis bed 



of tin.' basin of the Rhone in company with ' J though not an abun- 



dant fossil, and from a fragment in his possession inters thai the former may in 

 some cases have reached the great diameter of 220 mm. Quenstedt describes and 

 specimen of PtU. planorbe, var. leve, from Provence,* which he names 



M tin 1 designates the Planorbis bed in the region of the 

 1 I'Or as the " zone ol I /.' runV»"(our Cal. laqw H< coi 



that the beds of " lumachelle," the Planorbis horizon, show evidences of having 

 «ited during a period ol violent currents, Tins i- an important 



- the littoral character of the dep 

 ,. T in the department of Moselle, writes that Ammonites are generally 

 nid more often broken than Nautili in the Lowi i L is, and enumi 

 only six species. Chapuis and Den .'that in Luxemburg the Planor- 



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17". 17''.- 

 ■ I 



VII 



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