466 REPORT — 1893. 



oblong than the original figures referred to above, and is deeper (higher) 

 posteriorly; fig. 9 is more truly oblong; figs. 11 and 13 are more oblique, 

 sloping posteriorly ; fig. 15 is oblique, but shorter than figs. 11 and 13 ; 

 and fig. 18 is shorter and snbquadrate. 



The indications of interstitial ornament are feebly evident in. some of 

 those mentioned above, and we cannot find any in these now under ex- 

 amination. 



Differing from the foregoing varieties it should be regarded, we think, 

 as another variety, which we wish to specialise as Estheria striata, var. 

 Muensteriana, thus naming it after Count l^Iiinster, who was one of the 

 earliest observers of these Palaeozoic Phyllopods and of other fossil 

 bivalve Entomostraca. 



In its postero-dorsal angle and long hinge-line this form much 

 resembles the recent Estheria Buhidgei, Baird (' Proceed. Zool. Soc.,' 1862, 

 pi. 15, fig. 3). 



Fig. 1 illustrates the two valves lying together on the matrix, and 

 in fig. 2 the left valve is seen without any perspective. 



It is in bluish-grey Lebach shale of the lower part of the Rothliegende 

 (Permian), at Altenstadt in the Wetterau, Grand Duchy Hessen, where 

 it was discovered by Baron A. von Reinach with other fossils, namely, 

 Xenacanthus Decheni, Goldfuss ; Acantliodes, sp. ; Branchiosaurus amhlyo- 

 stomus, Credner (Proiriton petrolei, Gaudry), and some of the leading 

 plants of the Permian series. 



In these Lower Lebach shales from Altenstadt, Wetterau, A. von 

 Reinach also found numerous small Ostracodes, which T. R. Jones and 

 J. W. Kirkby have determined ^ as — 



Leperditia Okeni (Miinster), very common. 



,, var. acuta, J. and K., T , 



" " ui T J -c^ }" less common. 



„ „ „ oblonga, J. and K., J 



„ „ „ parallela, J. and K., rare. 



„ Youngiana, J. and K., rare. 



Cythere superba ? J. and K., common. 

 Bairdia ? &c. 



The series of formations yielding these Phyllopoda and Ostracoda 

 have been especially studied of late years, ^ and belong to the Roth- 

 liegende of the Permian system of the Middle Rhine, Main, and Wetterau 

 (equivalent to that of the Nahe and Saxony). 



Part of the Permian System. 



_ ,, ,. J f Kreuznach Beds. 

 Upper Rothliegende | ^^^^^^ g^^^^ 



r Upper "| ^ r Sotern Beds. 



I Middle > Lebach Beds f Tholey Beds. 



Lower Rothliegende < Lower J t^^'i ^^^^^^ Beds. 



Trans. Manchester Geol. Soc, vol. sxi. pt. 3, 1891, pp. 137-142, with plate. 

 ^ See Ch. E. Weiss, Fossile Flora der jungsten Steinkohlenformation und des 

 Rotldiegenden im Saar-Rliein- Gebiete, 1869-72, p. 6; Kayser's Lehrhuch der geolo- 

 gischen Formationskunde, 1891, p. 149 ; and A. voa Eeinach, ' Das Rothliegende in 

 der Wetterau und sein Anschluss an das Saar-Nahegebeit,' Ahhandl. Konigl. Preuss. 

 Geol. Landesanstalt. Neue Folge. Heft 8, 1892, p. 3. 



