ESTIIERIA MINUTA. 51 



Li the marls of the Muschelkalk of the same district, von Secbach also found 

 P. m'umta, with Gervlllia soctalis, Wism., Cololodns varius, Gieb., and casts of 



Hanover. Dr. Volger, of Gottingen, mentions in the ' Neues Jahrbuch f. Min.,' 1S46, 

 p. 8 IS, the occurrence of Posidonomya minuia in the neighbourhood of Gottingen, at 

 Ellichausen, in the Upper Keuper, and near Abbecke in the Soiling, not far from Dassel, 1 

 in the Upper Bunter Sandstone (laminated sandstone, alternating with marl-beds), in great 

 numbers ; and he suggests, " may it not be a bivalved Crustacean ?" 



In 1SG0. Baron von Strombcck, of Brunswick, described the position of the beds 

 containing Esthcria minuta, near Salzgitter, Hanover, in his paper on the Myophoria- 

 beds, published in the ' Zeitschrift der dcutsch. gcol. Gcsellschaft,' vol. xii. From infor- 

 mation derived from Here Schloenback, the following series of beds is said to be observed 

 at the foot of the Greif and at the Salgenteich, near Salzgitter 3 (p. 387). 



Variegated Keuper-marl. 



Lcttenkohle, 1 inch. 



Greyish-yellow, micaceous, and argillaceous sandstone, alternating with dark-blue laminated clay, 



Myophoria pes-anseris, M. transversa, Lingula tenuissima, and Posidonomya minuta. 

 Reddish-brown clay ; in its upper part a limestone (2 feet thick), containing Myophoria Struckmanni, 



M. pes-anseris, and Ammonites (CeratitesJ nodosus : 20 to 50 feet. 

 Muschelkalk. 



Close to Luneberg, 4 at, and near the Schafweide, the. section appears to be from 

 von Strombeck's account (p. 381, &c.) — 



Variegated Keuper-marl. 



Laminated clay (with Lingula tenuissima), alternating with thin beds of limestone, full of pseudo- 



morphic salt-crystals. 

 Dolomitic beds, 5 with Myophoria pes-anseris and Ammonites nodosus. 

 Dark greenish-blue clay : 100 feet. 



1 In the valley of the Sollen, twenty-three miles north-north-west of Guttingen. 



2 ' Ueber die Trias-Schichten mit Myophoria pes-anseris, Schlot., auf der Schafweide zu Liineburg.' 



3 See the geological map of this district, in ' Karsten's Archiv,' xxvi, pi. 1. 

 1 For a map, see 'Zeitsch. deutsch. geol. Gesell.,' 1853, vol. v, pi. 11. 



5 Belonging, according to the author, to the Lettenkohle-group, and not to the Upper Muschelkalk. 

 See also Von Strombeck's paper 'Ueber das Vorkommen von Myophoria {Trigonia, Lyriodon) pes- 

 anseris, Schlot., sp.' 'Zeitsch. d. deutsch. geol. Ges.,' 1858, vol. x, p. 80, &c. In this memoir (p. 86). 

 Posidonomya minuta is said to occur here and there in the Myophoria-beds, but not abundantly, in com- 

 pany with Myophoria;, Myacites letticus, Gervillia socialis, Pecten A'bertii, Lingula tenuissima, &e. 

 The last mentioned is figured in Bronn's ' Lethsea Geognost.,' vol. ii, part 3, p. 51, pi. 13, fig. 6. At 

 Liineburg, it lias not so sharp an umbo as in Bronn's figure. It occurs plentifully on the surface-planes 

 of the shales, and occasionally in the other beds, and always preserves its brownish thin shell (contrasting 



