JonEs AND Kirkpy—On Carboniferous Ostracoda from Ireland. 197 
and Ireland; but is not known to us as coming from anywhere abroad, although 
there are several closely allied forms. The specimen here figured is that from 
Granard, Co. Longford, which Dr. M‘Coy referred to in his ‘‘ Synop. Char. Carb. 
Foss., Ireland.” The concentric marks on it are artificial, and indicate the stages 
of its clearance from the limestone matrix. The central mark is accidental. 
38. Bairdia plebeia, Reuss. 
1854. Bairdia plebeia, . . Reuss, Jahresb. Wetterau. Gesell. for 1854, p. 67, 
fig. 5. 
1855. B. Geinitziana, . . Ricuter, Zeitsch. Deutsch. Geol. Gesell., vol. vii, 
p- 530, pl. xxvi., fig. 12. 
1858. B. plebeia, . Kriexsy, Ann. Mag. Nat. Hist., ser. 3, vol. ii, 
p. 324, pl. x., figs. 1-7. 
1859. it : . Kirgey & Jones, Trans. Tyneside Nat. Field-Club, 
vol. iv., pp. 141, 146, pl. ix., fig. 7. 
1861. Cythere (Bairdia) plebeia, Krrxpy, Quart. Journ. Geol. Soe., vol. xvii., p. 308; 
1862, Ann. Mag. Nat. Hist., ser. 3, vol. x., 
p- 203, pl. iv., figs. 5-10. 
1867. Cythere plebeia, . . Scumipt, Neues Jahrb., &., p. 581, pl. vi., fig 26. 
W8io. Bairdia ,,.~ * . Jones & Kirxpy, Ann. Mag. Nat. Hist., ser. 4., 
vol. xv., p. 56, pl. vi., figs. 6, 7; 1879, Quart. 
Journ. Geol. Soc., vol. xxxv., p. 569, pl. xxxviii., 
figs. 9-19; 1880, Quart. Journ. Geol. Soc., vol. 
Xxxvi., p. 588; 1885, Geol. Mag., dec. 3, vol. 
i, p. 540; 1886, Quart. Journ. Geol. Soe., vol. 
xli., p. 5138; 1887, Proceed. Geol. Assoce., vol. 
ix., p. 512. 
Valves having very much the shape of Bairdia eurta, but blunt and not hatchet- 
shaped in front, higher in the back, and less sharply pointed behind. 
This is a somewhat variable form, common in the Carboniferous and Permian 
strata of England, Scotland, and Germany. Some examples were found in the 
Carboniferous Limestone of Castle Espie, and a few, not well defined, in the 
shales at Cultra and Carland. 
TRANS. ROY. DUBL. SOC., N.S. VOL. VI., PART VII. 2H 
