Jonrs ann Kirxpy—On Carboniferous Ostracoda from Ireland. 175 
Limestone series in Scotland, and to the Yoredale Rocks in England, succeeding 
immediately above. 
The few species from Castle Espie indicate a higher horizon. All of them are 
common fossils right through the Yoredale Rocks and Carboniferous Limestone 
series. 
DESCRIPTION OF SPECIES. 
1. Cytherella valida, Jones & Kirkby. 
1884. Cytherella valida, Jonrs & Kirxey, “Monogr. Carbonif. Entom.,” Pal. Soc., 
p. 70, pl. vi., figs. 2a—c; pl. vii., figs. 13 a, 4, ¢(?). 
1885. ‘5 - Jones & Kirxsy, Geol. Mag., dec. 3, vol. 11., p. 540. 
1886. ie os Jones & Kirxsy, Quart. Journ. Geol. Soc., vol. xli., 
p. 509. 
There are several good carapaces from Carland, and other specimens from 
Cultra, of this fine Cytherella ; though scarcely so large and robust as it occurs in 
the North of England,* where it is often very abundant in Lower Carboniferous 
strata. 
The figures and description in the Paleontographical Society’s volume of 
Monographs for 1884 fail to give a good idea of this species. In Pl. vi, figs. 
2a and 26 have the posterior end placed upwards instead of downwards, which 
is described at p. 70 as being semicircular and narrow, whereas it is obliquely 
asymmetrical and broader (higher) than the front part of the valve. 
The obliquity at the hinder margin varies in individuals, sometimes only 
slightly interfering with the posterior curve, and then closely resembling Cytheredla 
extuberata. In other cases the postero-ventral obliquity modifies this hinder margin 
so much that it is bluntly acute above the medial line, somewhat like the 
appearance in C. attenuata, where its postero-ventral portion is obliquely truncate. 
2. Cytherella extuberata, Jones & Kirkby. 
1880. Leperditia extuberata, Jonups & Kirxsy, MS. Quart. Journ. Geol. Soc., 
vol. xxxvl., pp. 973, 576, 588. 
1886. Cytherella extuberata, Jones & Kirxpy, Geol. Mag., dec. 3, vol. vil. 
p- 251, pl. vii, figs. 13 a-d; Quart. Journ. Geol. 
Soc., vol. xli., p. 510. 
*It is good and common in Northumberland and Westmoreland, as well as at Calees, East 
Cumberland. 
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