Tones and Woodward—Fossil Phyllopoda. d31 
Part or THE PERMIAN SYSTEM. 
: Kreuznach Beds. 
Upper Rothliegende { TiVartann ieee. 
Upper )  Sétern Beds. 
| Middle } Lebach Beds. Tholey Beds. 
Lower Rothliegende. Lower j or < Lebach Beds. 
Upper Upper 
itowes } Cusel Beds. ee Cusel Beds. 
CARBONIFEROUS SYSTEM. 
Upper, Middle, and Lower Ottweiler Beds. 
Upper, Middle, and Lower Saarbriick Beds. 
Estherieg are also known in the Lower-Lebach Beds at Baerweiler- 
on-the-Nahe. 
2. Estueria Retnacutt, sp. nov. Pl. XIX. Fig. 3. 
Length, 3-2 mm.; hinge-line, 1°73 mm.; height, 1°86 mm. 
This suboval Hstheria, 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 also wider apart. 
This form is not so bluntly rounded at the ends as EH. tenella 
(Monogr. Foss. Hsther. p. 31, pl. 1, fig. 26; pl. 2, fig. 89; and 
pl. 5, figs. 1-7); and it is much too angular and sloping posteriorly 
to match Goldenberg’s pl. 2, fig. 9. In this last-mentioned feature 
it shows an alliance with Hstheria striata; but its shape and pro- 
portions decidedly separate it as a species, and we give it the name 
E. Reinachii, after Albert von Reinach, who discovered it in the 
light-grey shale of the Upper-Lebach Beds in the Hngelthal, near 
Altenstadt, in the Wetterau. 
3. HsTHERIA GEINITZII, sp. nov. Pl. XIX. Fig. 4. 
Length, 1-4 mm. ; hinge-line, 1:0 mm.; height, 1:05 mm. : 
This (left valve) is subquadrate, with the anterior and ventral 
more fully 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. pl. 2, figs. 1, 5), but is 
readily distinguishable. It is still nearer in shape to a form of 
HE. Mangaliensis, op. cit. pl. 2, figs. 20, 23, but the latter has not 
the postero-dorsal angle sufficiently pronounced. H. subquadrata 
(Grou. Mae. 1890, Pl. XII. Fig. 2) has some resemblance to the 
form shown by Fig. 4, but it is not truncate anteriorily, 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 distinguish this form from any yet published. We dedicate 
