Paleozoic Bivalved Entomostraca. 245 
2. Entomis serratostriata (Sandberger) (Pl. VI. figs. 4, 5) 
and E. gyrata (Richter) (PI. VI. figs. 3.a, 3 2). 
Several impressions and casts of different sizes in a light 
brown and somewhat schistose shale, labelled “ No. 2. Hnto- 
mis, Oural, Upper Devonian,” represent Hntomis serrato- 
striata (see Ann. & Mag. Nat. Hist. ser. 5, vol. iv. 1879, 
pp. 183 &e. pl. xi. figs. ith 5, 7, 18, and 14) and #. gyrate 
(cbid. figs. 4, 8, 10, il, and 12) ‘of the same geological for- 
mation. 
Pl. VI. fig. 5 shows a small convex cast of a delicately 
striated valve of 1. serratostriata (*75 millim. long), probably 
shortened by pressure. Fig. 4, also 4H. serratostriata (1 
millim. long), is a convex cast of a middle-sized or ordinary 
ovate-oblong valve, with fine but rather coarser strie. In 
some of the associated examples in the same schist the strize 
are thicker than in the foregoing, are more flexuous, and show 
an inosculation here and there. These features are traceable 
fie. 13, pl. xi. Ann. & Mag. Nat. Hist. (loc. evé.). In 
some also there are indications of the former existence of 
prickles, namely rows of minute pits accompanying the strie. 
In Pl. VI. fig. 3 we have a concave impression of the 
largest kind of valve (1°75 millim. long), with coarser strie. 
These are more definitely concentric (that is, meeting at the 
ends), and are strongly marked with the little pits which indi- 
cate the places of prickles on the original surface. ‘The speci- 
men of H. gyrata figured in the Amn. & Mag. Nat. Hist. loc. 
eit. fig. 4a G ae fig. 4 (©) nearly approximates to this 
and some others of the Ural specimens, 
M. Karpinsky’s note attached to these specimens is as 
follows :— 
“No. 2. Entomis semblable 4 Entomis serratostriata. Ces 
fossiles proviennent du versant oriental de l’Oural, ot ils se 
trouvent dans les couches dévoniennes supérieures avec Car- 
diola retrostriata et quelques Goniatites semblables & Gonia- 
tites retrorsus, mais tres mal conservés.” 
2a. In a very fine-grained and drab-coloured sandstone, 
labelled ‘‘ No. 2a,” there are some small hollow impressions 
(external moulds) of the ordinary /. serratostriata, and these 
are accompanied by two minute convex casts (or remnants of 
valves) of doubtful alliance. 
One of them (fig. 6), rather grey in colour and ‘90 millim. 
long, is somewhat like a Leperditia in outline, and has a 
rough pimply surface, and may possibly be a rugose Pramitia, 
Fr. Schmidt’s Leper ditia Mellert (Mise. Silur. iii. pp. 25 
Ann. & Mag, N. Hist. Ser. 5. Vol. xii. 18 
