JoNEs AND Kirkpy—On Carboniferous Ostracoda from Ireland. 187 
sub-central ovate boss; within the antero-dorsal angle is a small elongate lobule, 
rising from a narrow ridgé that curves downward, and runs out near the ventral 
border. 
The other and smaller example (fig. 72) shows some differences : it is more 
oblong in outline, the extremities being nearly of equal height, and the ventral 
margin is less convex; the tubercles or bosses are more isolated, and the antero- 
dorsal swelling is produced forward and teat-like. 
Though resembling Beyrichia Nova-scotica in some particulars, these specimens 
show such differences as to render it probably wiser to look upon them as belong- 
ing to a new form than to identify them with a species as yet known to occur 
only on the other side of the Atlantic. It is therefore kept distinct and named 
B. Hibernica. 
We may compare this interesting form with Ulrich’s Beyrichia simulatrix and 
Eichwald’s* B. colliculust and B. gibberosat (all Carboniferous species); and 
possibly they may all be regarded as indicative of a passage from Beyrichia to 
Drepanella. 
20. Beyrichia gigantea, Jones & Kirkby. 
An extraordinarily large Beyrichian form (Beyrichia gigantea), from Cork, is 
noted and figured in the ‘‘ Monogr. Brit. Carbonif. Entom.,” Pal. Soc., 1884, p. 88, 
pl. iv., fig. 28. It is known also from Derbyshire. 
21. Kirkbya Permiana, Jones. 
1850. Dithyrocaris Permiana, Jonvs, in King’s “Monogr. Permian Foss.,” Pal. Soc., 
p- 66, pl. xviii., figs. la—-d. 
1854. Ceratiocaris Permiana, Jones, in Morris’s ‘‘ Catal. Brit. Foss.,” edit. 2, p.108. 
1858. Leperditia(?) Permiana, Kirxesy, Ann. Mag. Nat. Hist., ser. 3, vol. 1., p. 434, 
pl. x1., figs. 5—13. 
1859. Kirkbya Permiana, . Jones & Kirxsy, Transact. Tyneside Field-Club, 
vol. iv., p. 129, pl. viii., figs. 1, 2, 3, and 5; 
pl. x., figs. 5, 7, 9-12. 
1861. 4 a . Kuirxpy, Quart. Journ. Geol. Soc., vol. xvii, p. 308. 
1861. 3 x . Jones & Kirxsy, Trans. Geol. Soc., Glasgow, vol. 
ii., p. 220. 
1867. A Hi . Ricuter, Zeitsch. Deutsch. Geol. Ges., Jahrg. 1867, 
p. 224, pl. v., figs. 1-3. 
* Journ. Cincinn. Nat. Hist. Soc., vol. xiii., p. 205, pl. xviii., figs. 7a, 0. 
+ ‘ Lethea Rossica,” livr. 7, 1860, p. 1348, pl. lii., figs. 1a, 0. 
t Tbid., p. 1349, pl. lii., figs. 11a, 4, ¢. 
