52 Prof. T. Rupert Jones — Fossil Estherice. 



E. Lewisii, Geol. Mag. Sept. 1890, p. 385, PL XII. Fig. 3, with the 

 limbo further forward and a different ornament. Otherwise these two 

 species, as well as E. multicostata (Emmons), " Monogr. Foss. Esth." 

 p. 86, fig. 6, and E. ovnlis (Emmons), op. cit. p. 87, fig. 8, are 

 evidently allied forms, though the last two have most probably 

 been badly drawn. 



4. EsTHERiA MiNUTA (Alberti), 1832. PL 11. Fig. 12. 



Jones, Synonymy in the " Monograph of the Fossil Estherise, Palseont. Soc. 1862," 

 p. 42; F. von Alberti's " Ueberblick iiber die Trias," etc., 1864, pp. 191 

 and 192 ; Jones, Geological Magazine, Dec. III. Vol. VII. 1890, PL XII. 

 Figs. 4-8. 



Length 3-0 (hinge-line 2-0), height 1*9 mm. 



This is a specimen occurring in the Lower-Bunter shale at 

 Diirrenberg, in Saxony, with Esiheriella costata, Weiss. It is very 

 much like it, as seen in Fig. 9, but is smaller and has no radial striae. 

 It has the same number of concentric lines, and therefore cannot be 

 the young of the larger form ; and the occurrence of the radii is too 

 persistent among the many EstherielJcB in the shale, to allow of the 

 supposition that they constituted merely a casual feature and were 

 not always present in the same series of valves. Fig. 12 maybe 

 compared with fig. 8 of pi. v. and fig. 29, and even with fig. 28, 

 of pi. i. of the " Monogr. Foss. Esth." as a specially straight-backed 

 form of the species. 



Fig. 12 may possibly be Estheria German [Posidonia, Beyrich, 

 Zeitsch. D. g. Ges. vol. ix. 1857, p. 377), from the Bunter at the 

 Steinberg, noi-th of the Hartz, and at Halle and Diirrenberg, both 

 in Saxony. Andrae, in the Explanation of the Geological Map of 

 Halle, 1850, p. 67, referred to it as P. minuta. It is characterized 

 by having a long and straight hinge-border ; and according to 

 Prof. Weiss it has no radial markings. 



Besides the authors treating of the occurrence of Estheria minuta 

 in the German Trias that are enumerated in the " Monogr. Foss. 

 Esth," pp. 44 et seq., we should mention C. von Schauroth, Zeitsch. 

 D. g. Ges. voL ix. 1857, p. 99 (Coburg). 



4*. Estheria mintjta (Alberti), var. Brodieana, Jones. 

 PL II. Fig. 14. 



Monogr. Foss. Estheriae, 1862, p. 69, pi. ii. figs. 8-15, and pi. v. fig. 10 ; Geol. 

 Mag. Dec. 3, Vol. VII. 1890, p. 388, PL XII. Fig. 6. 



Length 3 (hinge-line 2), height 2-5 mm. 



Lately Mr. C. E. De Eance, F.G.S., has obtained from the "Old 

 Alderley Quarry," at Alderley Edge, Cheshire, a small shoal-like 

 group of Estherice in a soft, dull red, finely micaceous shale, belonging 

 to the upper part of the " Keuper Marls," f. 6 of the Geological 

 Survey Map, and a thousand feet lower down in the Trias (being 

 below the waterstones, f. 5) than any of the English examples of 

 ^. minuta yet found. 



The specimens occur both as single valves and in open pairs ; 



