Paleozoic Bivalved Entomostraca. OF 
6**, Bairdia plebeia, Reuss, var. munda, nov. 
BIA Viedies i. 
We have one specimen of another variety of B. plebeia 
from the yellow limestone of Likhwine. It is rather more 
oblong than the usual form of the Permian B. plebeia, and its 
posterior angle is less developed. See Reuss, ‘‘ Ueber Entom.”’ 
&c., Jahresb. Wetterauer Ges. 1854, p. 67, f. 5. 
7. Cythere (Potamocypris ?) bilobata (Von Minster). 
PloVas ties: 8, 95 10. 
Bairdia excisa (?), D’Eichwald, Leth. Ross. i. vii. p. 1342, pl. 52. f. 8. 
We have three specimens of this species from the yellow 
limestone near’ Likhwine. They were sent to us by D’Kich- 
wald labelled as “Batrdia excisa.” They nevertheless un- 
doubtedly belong to Von Miinster’s “Cythere (?) bilobata’’t, 
to which we now refer them. 
D’Eichwald’s figures show a much greater constriction on 
the subconcave border than we find in our specimens. 
The recent Potamocypris fulva, G. S. Brady (Ann. & Mag. 
N. H. ser. 4, iii. pl. 18. figs. 1-4, and Nat. Hist. Transact. 
Northumb. and Durham, iil. p. 366), presents an external ap- 
pearance remarkably similar to that of Cythere (?) bilobata. 
8. Cytherella Murchisoniana, sp.n. Pl. VI. fig. 13, a, 4, 
fig. 14, a-c. 
In a fragment of brown crystalline limestone, from a locality 
30 wersts east of Bugulina, collected by the late Sir Roderick 
Murchison, we have numerous specimens of a small Entom- 
ostracan, which probably belongs to the genus Cytherella. 
It is 31; inch long, and half as high. The carapace-valves 
(always separate) are oblong in outline, with the dorsal and 
ventral borders nearly parallel; the ends are rounded; the 
posterior extremity is most obtuse; and from the region ad- 
joining it the carapace contracts so as to give rather a wedge- 
shaped dorsal aspect. In casts a slight constriction crosses 
the valves near the posterior third (fig. 14,6). The shell is 
thick, and the surface apparently smooth. 
+ Ann. & Mag. N. H. ser. 3, vol. xv. p. 409, pl. 20. f. 10. This species, 
not uncommon in some Carboniferous rocks of Britain and Europe, was 
described by us (loc. cit.) as a Cythere ; it is most probably either a Pota- 
mocypris or a Badia. 
