on the fossil phyllopoda of the palieozoic rocks. 467 



Carboniferous System. 



Upper, Middle, and Lower Ottweiler Beds. 

 Upper, Middle, and Lower Saai'briick Beds. 



Estherice are also known in the Lower Lebacli Beds at Baerweiler-on- 

 the-Nahe. 



2. Estheria Beinachii, sp. nov., Plate L, fig. 3. 



Length, 3'2 mm. ; hinge-line, 1'73 mm. ; height, 1'86 mm. 



This suboval Estheria, represented by two united valves (concave and 

 ■one imperfect), is shorter and proportionally higher than fig. 2, and has 

 a much shorter hinge-line, which is straight, and not quite equal in 

 length to the height of the valve. The umbo is not so near to the 

 antero-dorsal angle as it is in figs. 1 and 2, and therefore the ridges or 

 lines of growth are less obliquely concentric with the umbo ; they are 

 a,lso wider apart. 



This form is not so bluntly rounded at the ends as E. tenella 

 (' Monogr. Foss. Esther.,' p. 31, pi. 1, fig. 26 ; pi. 2, fig. 39 ; and pi. 5, 

 figs. 1-7) ; and it is much too angular and sloping posteriorly to match 

 "Goldenberg's pi. 2, fig. 9. In this last-mentioned feature it shows an 

 «,lliance with Estheria striata ; but its shape and proportions decidedly 

 separate it as a species, and we give it the name E. Beinachii, after 

 Albert von Reinach, who discovered it in the light-grey shale of the 

 Upper Lebach Beds in the Engelthal, near Alteustadt, in the Wetterau. 



3. Estheria Oeinitzii, sp. nov., Plate I., fig. 4. 



Length, 1'4 mm.; hinge-line, I'O mm. ; height, 1'05 mm. 



This (left valve) is subquadrate, with the anterior and ventral more 

 iully rounded than the posterior border. The back is straight, and the 

 umbo is at its front end. 



This somewhat approaches to the shorter and deep (high) forms of 

 Estheria minuta (' Monogr. Foss. Esther.,' pi. 2, figs. 1, 5), but is readily 

 distinguishable. It is still nearer in shape to a form of ^. Maagaliensis, 

 op. cit., pi. 2, figs. 20, 23, but the latter has not the postero-dorsal 

 angle sufficiently pronounced. E . suhquadrata (' Geol. Mag.,' 1890, pi. 12, 

 fig. 2) has some resemblance to the form shown by fig. 4, but it is not 

 truncate anteriorly, and its postero-dorsal angle is weak. 



The steep slope of the front edge, the full ventral curve, the contracted 

 posterior moiety, and the well-pronounced postero-dorsal angle distin- 

 guish this form from any yet published. We dedicate it to our old friend 

 Hofrath H. B. Geinitz, of Dresden, who has always been deeply inter- 

 •ested in fossil Entomostraca and in the strata from which those of the 

 Wetterau have been obtained. 



This short form, deep (high) in its anterior moiety, is abundant 

 {gregarious) in a dark greenish-grey, nearly black shale, ferruginous on 

 one face, of the Lebach Beds, from the Boos Tunnel, on the Rhine-Nahe 

 Railway, and on the same geological horizon as at Altenstadt. 



4. Estheria Geinitzii, var. Grebeana, nov., Plate I., fig. 5. 

 Length, 1-2 mm. ; hinge-line, 1'05 mm. ; height, 0'9 mm. 



Fig. 5 (right valve) is subtriangular and diSers from fig. 4, owing to 

 the great proportional length of the hinge-line and the less fully rounded 



H H 2 



