304 Prof. T. R. Jones and Mr. J. W. Kirkby on the 
3. Bythocypris (2) cuneola, Jones and Kirkby, var. 
(Pl. XVI. fig. 4.) 
Bythocypris(?) cuneola, J. & K., Ann. & Mag. Nat. Hist. ser. 5, 
vol, xviii. 1886, p. 250, pl. vi. figs. 1 and 2. 
Fig. 4 represents a single specimen of a small Ostracod 
that is doubtfully identified with 2. (?) cuneola. It has about 
the same size and general appearance, but its extremities are 
too nearly alike; and its edge-view is scarcely cuneiform 
enough for exact agreement with that species. It may, 
however, be a variety of it. 
B. (?) cuneola is a common species in the Carboniferous- 
Limestone series of the North of England and Scotland. 
4. Bairdia curta, M‘Coy. (Pl. XVI. fig. 5.) 
Bairdia curta, M‘Coy, Jones and Kirkby, Quart. Journ. Geol. Soc. 
vol. xxxv. 1879, p. 567, pl. xxviii. figs. 1-8. 
The specimen here figured is a nearly perfect individual of 
B. curta (there are other specimens more or less imperfect), 
and it shows the elegant form and broad subangulate anterior 
extremity characteristic of this species. 
B. curta was the first-discovered representative of the 
genus, and, though now well known as a British Carboniferous 
fossil, it is nowhere abundant, nor had it until now been 
found out of the British Isles. 
5. Bairdia subelongata, Jones and Kirkby. 
(Pl XV fig SG.) 
Bairdia subelongata, J. & K., Quart. Journ. Geol. Soc. vol. xxxv. 1879, 
p. 573, pl. xxx. figs. 1-11 and 16. 
Many of the specimens of this small set of Mongolian 
Ostracoda belong to £. subelongata; and, though one of the 
most typical has been chosen for illustration, there are others 
showing much the same range of variation that obtains in 
series of British specimens, as neticed in our memoir on 
Bairdia (Quart. Journ. Geol. Soc. 1879). 
B. subelongata is a well-known species from the Carbon- 
iferous-Limestone series of Scotland and the north of England. 
6. Bairdia plebeia, Reuss. (Pl. XVI. figs. 7 and 8.) 
Bairdia plebeia, Reuss, Jahvesb. Wetterau. Ges. 1854, p. 67, fig. 5; 
Jones and Kirkby, Quart. Journ. Geol. Soc. vol. xxxv. 1879, 
p. 569, pl. xxviii. figs. 9-19, 
