ANIMALS. 63 
No. 6. CyTHERE (BArIRDIA) GRACILIS, J/‘Coy. Tab. XVIII, fig. 7. 
BarRpia GRACILIS,; M‘Ooy. 1844. Syn. Char., &., p. 165, pl. xxiii, fig. 7. 
INCH. 
Length, 3; 
Height, ,4, 
A cast, much worn, of a carapace nearly allied to B. curta, but much narrower ; 
probably Prof. M‘Coy’s B. gracilis. 
Locality, Byers’ Quarry. 
No. 7. CYTHERE (CYTHEREIS *) BIPLICATA, zodis. Tab. XVIII, fig. 8. 
INCH. 
Length, 2, 
Height, > 
Carapace sub-ovate, convex, bearing two short, longitudinal, rounded ridges near 
the middle of the valve. Dorsal and ventral borders elliptical. Anterior extremity 
rounded ; josterzor acute. 
The hinge of this unique and interesting specimen having disappeared, we can 
only provisionally place it in the sub-genus Cythereis, to which it is probably allied, 
particularly to C. triplicata, Roemer,’ and other similar forms. 
Locality, Byers’ Quarry. 
No. 8. CYTHERE (CYTHERELLA !) INORNATA, J/‘Coy. Tab. XVIII, fig. 9. 
C. inornata, M‘Coy. 1844. Syn. Char., &c., p. 167, pl. xxiii, fig. 18. 
INCH. 
Length, =, 
Height, 55 
Carapace nearly oblong, sub-reniform, smooth, convex. Dorsal border slightly 
elliptical ; ventral almost straight. Anterior extremity obliquely rounded ; posterior 
semicircular. 
This form seems to be identical with C. inornata, M‘Coy, of the Lrish Carboniferous 
formation. 
One specimen from Byers’ Quarry. 
No. 9. CyTHERE (BarrpiA ?) acuta, zobis. Tab. XVII, fig. 10. 
INCH. 
Length, 35 
Height, 53; 
Carapace sub-triangular, smooth, convex. Dorsal edge rounded, produced ;_ ventral 
nearly straight. Hztremities acute. 
1 See Jones, Monog. Entom. Cret. Formation, p. 18, tab. iii, fig. 9. 
