246 Prof. T. R. Jones on the 
and 88, pl. i. figs. 23-25, and pl. v.a, figs. 23 and 24) is — 
rugose or pimply ; but its larger size and difference in shape 
do not allow of further comparison with this minute rugose 
Leperditioid Primitia (?). 
Fig. 7 is also a minute convex internal cast (‘90 millim. 
long), the outline of which is not well exposed; and it has 
a roughly pitted or coarsely reticulated surface, as if the 
matrix were still adherent between pimples or little pustules, 
like those of fig. 6 ; and it is probably of the same species. 
These in some degree resemble the granulate variety of 
Primitia cylindrica (Beyrichia, Richter), Zeitsch. d. d. geol. 
Ges. vol. xv. 1863, p. 671, pl. xix. fig. 12, from the Upper 
Silurian schists of Thuringia *, but not that treated of, abid. 
xvi. p. 365, pl. x. fig. 7, which seems to me to be quite 
another kind of organism (see Geol. Mag. dec. 2, vol. vii. 
p- 342). 
A small spinose or rugose Entomostracan has been noticed 
by Richter, namely his Cythere spinosa, from the Lower Car- 
boniferous or “Culm” of Thuringia (Zeitsch. deutsch. geol. 
Ges. vol. xvi. 1864, p. 161, pl. iii. fig. 2) ; but this differs too 
much from the little Devonian fossil before us to allow of any 
approach to identification. 
3. Estheria striata (Minster), var. tenutpectoralis, nov. 
(PL. VI. fig. 2.) 
In a very fine-grained, soft, grey, sandy shale, full of 
minute carbonaceous specks, and labelled “ No. 3. Hstheria, 
sp., Oural, Kamensk, Lower Carboniferous,” is a delicate 
impression, or flattened cast, of a subovate Hstherta, 5 millim. 
long by 4 millim. high. Its straight back is not quite perfect 
at the two ends; but its umbo was evidently close to the 
antero-dorsal end, as in L/. str¢ata and some others. In this 
feature, and in the bold oblique curve of the postero-ventral 
margin, this form markedly approaches L, striata (see Monogr, 
Foss. Esth., Pal. Soc. 1863, p. 23, pl. 1. figs. 13 and 15) ; but 
it slopes too much, and is not full enough, on the antero-ventral — 
margin, to exactly match any of the forms of that species. 
It is of the same size as the small, but suboblong. variety of 
fi. striata figured ibid. fig. 18. Nor does it come close 
enough to KH. tenella (Jordan), dbid. fig. 26, in the relative 
fulness of the front margin, nor even to 2. Peachi, Jones, 
another Carboniferous species (Geol. Mag. vol. vii. 1870, - 
* The Thuringian Beyrichie figured and described without a locality 
in the Geol. Mag. dec. 2, vol. viii. pp. 542, 345, pl. x. figs. 1-6, are from — 
the Nererte-beds at the Graftenthal and Steinach, near Saalfeld. 
