Jones AnD Kirxpy—On Carboniferous Ostracoda from Ireland. 189 
Some single valves with longitudinal ribs, and a reticulated surface, from 
Carland, come nearer to this species than to any other, and are referred to it 
without much doubt. 
This type of Airkbya, however, comes near to Beyrichiopsis, and the discovery 
of specimens of it with marginal fringes would cause their removal to that genus. 
This is not a common species; known in England only in Somerset; in 
Scotland, however, it has been found in Fifeshire, Edinburghshire, Roxburghshire, 
Argyleshire, and Peeblesshire. 
24. Kirkbya costata (M‘Coy). 
1844. Cythere costata, . . M‘Coy, “‘Syn. Char. Carb. Foss.,” p. 165, pl. xxiii., 
fig. 11. 
1866. Kirkbya costata, . . Jones & Kirxsy, Ann. & Mag. Nat. Hist., ser. 3, 
vol. xviil., p. 43. 
1884. ¥3 - . . Jones, Kirxpy, & Brapy, ‘ Monogr. Brit. Foss. Bi- 
valve Entom.,” Pal. Soc., p. 89, pl. vii., fig. 17. 
1885. 55 3 . . Jones, & Kirxpy, Ann. & Mag. Nat. Hist., ser. 5, 
vol. xv., p. 186, pl. iii., figs. 13a, b, 144, 5; 
Geol. Mag., dec. 3, vol. ., p. 540; 1886, 
Quart. Journ. Geol. Soc., vol. xlii., p. 511. 
1891. Kirkbya(? Barychilina) Utricu, Journ. Cincinnati Soe. Nat. Hist., vol. xiii., 
costata, p- 208, pl. xvii, figs. 2a, b. 
This species is present at both Cultra and Carland. It is a strongly-marked 
species, and not easily mistaken, even when in poor or fragmentary condition. 
Professor M‘Coy described it as of rare and solitary occurrence. It certainly 
is not among the most common of Carboniferous Ostracoda, though in some 
Northumberland localities it is very abundant ; notably so at Plashetts in Lower 
Carboniferous strata. 
It has been found also in the Carboniferous Limestone series in Shropshire, 
Somerset, Westmoreland, Cumberland, Northumberland, Lanarkshire, and Fife- 
shire. 
25. Beyrichiopsis fimbriata, Jones & Kirkby. 
1886. Beyrichiopsis fimbriata, Jones & Krirxsy, Geol. Mag., dec. 3, vol. iii, 
p. 434, pl. xi., figs. 3-10, and pl. xi, fig. 5(?); 
Quart. Journ. Geol. Soe., vol. xlii., p. 511. 
Examples of one or more species of Beyrichiopsis are comparatively common 
among the Ostracoda from Carland. Some of them show portions of the marginal 
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