244 Prof. T. R. Jones on the 
on some specimens of fossil Entomostraca which had been 
obtained from the Devonian, Carboniferous, and Rheetic (?) 
formations of the Ural (eastern). Referring to the specimens 
the Professor observed :—“ ‘Toutes ces especes étaient jusqu’’d 
présent inconnues dans les sédiments de l’Oural ; la plupart 
de ces fossiles ne pourraient étre trouvés que par les explora- 
tions souterraines 4 profondeur de quelques pieds.” 
1. Estheria minuta (Alberti), var. Karpinskiana. 
(PIS Viv ties 1 a) 10) 
These specimens of an Estheria, labelled ‘‘ No. 1. Estheria, 
Oural, District Troizk, Triassic or Jurassic (Rheetic ?),” are 
imbedded in a somewhat ferruginous and slightly calcareous 
shale, rather hard, and breaking into irregular pieces. The 
Estherie have been squeezed out of shape in one direction or 
another; but the most perfect shows the outline given in 
Pl. VI. fig. 1a, in size about 4 millim. long by 3 millim. 
high. Some slight carbonaceous relics of the valves remain 
here and there. 
All the specimens in the pieces of shale appear to belong to 
one species. ‘The shape most nearly approaches that of H, 
minuta, Monogr. Foss. Estheriw, Pal. Soc. 1863, pl. i. fig. 5 
where the dorsal joins the anterior margin with a simple 
convex curve without any depression in front of the umbe. 
As to size, however, these are smaller than H. minuta and 
rather larger than /. minuta, var. Brodieana, Jones (ibid. 
fig. 9), and much larger than some specimens of this variety 
(ibid. figs. 12 and 14). 
Some trace of ornament remains on portions of the black 
film representing the valves, in the form of minute, irregular, 
vertical, wavy corrugations between the concentric ridge- 
lines (fic. 1b). A modification of such reticulation as occurs 
on some specimens of . minuta might produce this appear- 
ance. 
This Zstheria, from the eastern side of the Ural, may be 
regarded as a variety of #. minuta (var. Ka pinskiana), but 
whether Triassic or Rheetic, or even Jurassic, in age remains 
doubtful. The note which Prof, Karpinsky attached to the 
specimens is as follows :— 
“No. 1. Les Esthéres, qui peut-étre ne présentent qu'une 
variété d’Estheria minuta. Ces Esthéres se trouvent sur le 
versant oriental de l’Oural dans les sédiments d’eau douce 
avec les restes des plantes mal conservées, qu’on peut déter- 
miner comme les espéces jurassiques—A splentum whithy yense, 
var. tenuis, Podozamites lanceolatus et Phyllotheca striata.” 
