50 FOSaiL ESTHER!^. 



part 3, p. GO, after a list of synonyms, of which we have availed ourselves (with some 

 slight corrections), Posidonomya mimrfa is stated to occur in the following localities. 



Rarely in the Bnnter Sandstone, with plants, at Snlzbad and Corcelles ; also 

 in the uppermost part of the Muschelkalk (£), near Biberfeld in Wiirtemberg ; more 

 [plentiful in the Lettenkohlcn-Grnppe (/c) of Wiirtemberg on the Schwarzwald, near 

 llottweil, at Rottenmiinster, and elsewhere (o, p, Alberti, t Quenstedt) ; also at 

 Pforzheim and at Sinsheim, near Heidelberg ; in the uppermost layers of the 

 Keuper Sandstone (ee) in Wiirtemberg (Tabingen) ; and, as it appears, still higher, 

 increasing in size (to 7'" long). Lastly, at Hassfnrth, near Schweinfnrth (Goldfuss), and 

 in the Kenper, near Weimar ; in the Upper Kcnper, at Elliehausen, near Got tin gen, and 

 in the Upper Bnnter Sandstone, near Dassel, in the Soiling. Posidonia Keuperina has 

 been recorded from the Lower Kenper beds at Hall, in Swabia, and is probably identical. 



On the other hand, adds Bronn, the occurrence of the true P. mimrfa in the Russian 

 Copper-sandstone (Kutorga, in Jahrb., 1844, p. 742, and his Zweit. Beitrag zur Palaontol. 

 Russl., 1844, p. 14, pi. 1, fig. 4 (Comp. Jahrb., 1849, p. 754), and in the Kenper of the 

 Venetian Alps (Catullo in ' N. Ann. Scienz. di Bologna,' 184G, Febbr.), is very doubtful. 



Thuringia. — The published notes on the occurrence of Estheria mimrfa in the Thu- 

 ringian Trias are as follow : 



1849. Herbst ('Neues Jahrbueh, f. Min.,' 1849, p. 545) refers to P. mimrfa being- 

 met with in the Keuper of Weimar. 



185G. Dr. J. G. Bornemann has treated of Posidonia mimrfa in his work 

 'Ueber organische Reste der Lettenkohlengruppe Thiiringens,*' 4to, Leipsic, 1856, p. 179, 

 and figures it (indifferently) in his plate 1, fig. 9. It occurs, he says, at Johannisthal, 

 near Muhlhausen, and elsewhere, in great numbers on the surface-planes of the Myacites- 

 clays of the Letten-coal group, associated with Trigonia transversa} Bornem., and 

 Mfacites leiticus, Bornem., and in a similar state of preservation ; and also in the black- 

 grey shales which accompany the Lettenkohle, but in bad preservation. It reaches 

 generally to about three millemetres in length. Venus douacina, Goldf., and Zing/da 

 tenuissima, Bronn, with remains of Acrodus Gaittardoti, Ag., and teeth of Plaeodas also 

 occur in the Myacites-clays. 



1857. In a paper on the Entomostraca of the Trias of Thuringia, in the ' Zeitschrift 

 deutsch. geol. Gcsellschaft,' vol. ix, p. 198 (1857), K. von Seebach mentions the occurrence 

 of Posidouomga mimrfa, Bronn, in marls, immediately underlying the Lettenkohle of the 

 Keuper, at the Gelmcrodaer Berg and elsewhere, near Weimar, where it is accompanied 

 with Acrodus Gaittardoti, Ag., Colobodus varius, Gieb., Plant-remains, Myoploria 

 transversa, Mgaeites, Cglhcre" Pgrus, Seeb., C. procera, Seeb., C. teres, Seeb., and ('. 

 dispar, Seeb. 



1 This is the Lyriodon vulgare, Goldfuss, 'Petref. Germ.,' ii, p. 198, pi. 135, fig. 16, c. 

 - Von Seehach terms the first three of these Entomostraca Bairdia, but to me they do not appear to 

 belong to that subgenus. 



