192 JonES AND Kirkpy—On Carboniferous Ostracoda from Ireland. 
to general shape; but, having a pair of oval lobules, in the same relative position 
as the two narrow dorso-median ridges in that species, it cannot be the same. In 
its well-developed margins, though they are not so sharp, and its reticose orna- 
ments, it shows its alliance with X. rigida.* Its symmetrical pair of two isolated 
lobules, one on the front, and the other on the hinder moiety of the valve, remind 
us of the less uniform features in the ‘‘ small bituberculate and punctate valve” of 
Ulrichia Conradi, Jones, from the Devonian of Canada (Quart. Journ. Geol. Soc., 
vol. xlvi., 1890, p. 544, woodcut, fig. 2). Here, however, the lobules are unequal 
and oblique, and the outline of the valve is different. 
Doubtless our Irish specimens belong to Ulrichia, as defined in the Quart. 
Journ. Geol. Soc., vol. xlvi., p. 543 (1890), and vol. xlix., pp. 293 and 303. 
Hence we remove it from Beyrichia to that genus. 
M‘Coy’s specimen came from Cultra, near Holywood, Co. Down. We have 
also seen this species from the locality ‘“‘ No. 11” (‘‘ Explan. Memoir of Sheets 
37, 38, Geol. Survey Ireland,” 1871, p. 17), near the Dalchoolin landing-place, a 
little north of Holywood. 
In Scotland it occurs in the Lower Coal-measures at Orchard and Brockley, 
near Glasgow. 
A good specimen from the ‘‘ Upper Limestone (Carboniferous series)” at 
Williamswood, near Cathcart, 4 miles south of Glasgow, has been selected for 
illustration of this rare and interesting species, hitherto unfigured, except in 
M‘Coy’s somewhat unsatisfactory sketches. 
29. Bythocypris sublunata, Jones & Kirkby. 
1886. B. sublunata, . . Jones & Krirxsy, Geol. Mag., dec. 3, vol. i, 
p- 250, pl. vii. figs. 9a, 6, 10, 11; Quart. 
Journ. Geol. Soc., vol. xlii., p. 512. 
Very abundant both at Cultra and Carland; and agreeing well in the lunate 
form of carapace, thickness of shell, and the all-round overlap of the right valve 
by the left, with typical examples of the species. 
This is another characteristic Lower Carboniferous species which is an 
abundant fossil in some localities of Roxburghshire ; less so in Fife ; but not at all 
rare in the Carboniferous shale underlying Secondary rocks, in Northamptonshire, 
as proved by the deep boring at Gayton. 
* This also is closely allied to Ulricha. 
