Jones AND Kirkpy—0On Carboniferous Ostracoda from Ireland. 193 
30. Bythocypris Phillipsiana (Jones & Holl), var. carbonica, 
Jones & Kirkby. 
1869. Bairdia Phillipsiana, . Jones & Hox, Ann. Mag. Nat. Hist., ser. 4, vol. ii, 
p. 213, pl. xiv., fig. 7. 
1885. Bythocypris Phillipsiana, Jones & Kirxsy, Geol. Mag., dec. 3, vol. ii., 
var. carbonica, p- 040. 
1886. Bythocypris Phillipsiana, Jones & Kirxsy, Ann. Mag. Nat. Hist., ser. 5, 
var. carbonica, vol. xvili., p. 250, pl. vi. figs. la, 6, 2a, b; 
Quart. Journ. Geol. Soc., vol. xlii., p. 512. 
A little bean-shaped carapace, rather common among the Carland Ostracoda, 
comes nearer to the above species than to any other—so far at least as we can 
speak of its Carboniferous variety. 
Some individuals, however, are more equal-ended than typical examples of the 
latter variety ; others become very like Cytherella in the unequal size of the valves, 
amount of marginal overlap, and thickness of shell. So there may possibly be 
more than one species in this lot of small carapaces: a matter we cannot settle at 
present with the material before us. 
The variety carbonica belongs to the Carboniferous rocks of Westmoreland, 
Northumberland, and Lanarkshire. 
31. Bythocypris(?), sp. 
It is necessarily difficult, if not impossible, to determine the generic standing 
of this simple cast from the shale at Carland. Its elongately sub-obvate shape 
reminds us of some valves formerly referred to Cytherideis,—to others belonging 
to Macrocypris, and others to Bythocypris; and of the last, especially one species 
named B. testacella, Jones (Ann. Mag. Nat. Hist., ser. 5, vol. xix., p. 186, pl. v., 
fig. 5a), although our Carboniferous specimen is slimmer and more elegant, that is 
lower, with less dorsal convexity. In Bythocypris the left valve should be the 
largest, overlapping on the back; but this characteristic feature cannot be 
determined in this case, and the specimen must remain unnamed. 
32. Argillecia equalis, Jones & Kirkby. 
1882. Cythere equalis, . . Jones & Kirxsy, MS. Quart. Journ. Geol. Soe., vol. 
XXXV1., pp. 973, 576, 588. 
1885. Argillecia ,, . . Jones & Kuirxpy, Geol. Mag., dec. 3, vol. ii., 
p. 540. 
