580 
T. R. JONES AND J. W. KIRKBY ON 
EXPLANATION OF THE PLATES. 
Puate XXVIII, 
(All the specimens are magnified 25 diameters.) 
Fig. 1. Bairdia curta, M‘Coy ; left valve of the original specimen, freed from 
3 
O&o MO WHK 
Fig. 1. 
Fig. 1. 
ee) 
matrix. Granard, co. Longford, Ireland. Fig. 2, ventral view of 
same. 
. B. curta; right valve and edge of left valve of a specimen belonging 
to Mr. John Young. From Brockley, near Lesmahagow. Fig. 4, yen- 
tral view of same. 
. B. curta, var. terebra; single right valve. Wyebourne, Cumberland. 
. B. curta; left valve. Settle, Yorkshire. 
. B. curta, var. bicornis; right valve of a specimen belonging to Mr. 
James Thomson. From West Broadstone, Ayrshire. 
. B. curta, var. deformis; right valve. Steeraway, Salop. In Mr. 
Charles Moore’s collection. 
. Bairdia plebeia, Reuss ; left valve. Newfield Quarry, High Blantyre. 
Fig. 10, dorsal view; fig. 11, ventral view; and fig. 12, end view 
of same. 
. B. plebeia; left valve. Newfield Quarry. 
. B. plebeia; right valve. Craigenglen, Campsie. 
. B. plebcia ; left valve, showing surface-ornament. Craigenglen. 
. B. plebeia; left valve of a gibbose specimen. Backwell, Somerset. 
Figs. 17 & 18, ventral and end views of the same. In Mr. C. 
Moore's collection. 
. B. plebeia; left valve of a small specimen. SBrocastle, South Wales. 
In Mr. C. Moore’s collection. 
. Bairdia ampla, Reuss; right valve. Hairmyres, Hast Kilbride. 
Figs. 21 & 22, dorsal and end views of the same. 
. B.ampla; cast of left valve, showing muscle-spots. Wyebourne, 
Cumberland. 
PLATE X XIX, 
(All the specimens are magnified 25 diameters.) 
Bairdia grandis, nu. sp.; left valve. Whorlton, Durham. Fig, 2, 
dorsal view of same. 
. Bairdia ampla, Reuss ; left valve. Whorlton. 
. Bairdia Hisingeri (Minster); right valve and edge of left valve. 
Craigenglen, Campsie. Fig. 5, dorsal view; fig. 6, ventral view ; 
fig. 7, anterior view ; and fig. 8, posterior view of the same. 
. B. Hisingeri; left valve. Craigenglen. 
. B. Hisingeri; right valve, with shell partly removed, showing impres- 
sion of muscle-spot. Craigenglen. 
. Bairdia mucronata, Reuss; left valve. Whorlton. 
. Bairdia submucronata, u. sp.; left valve. Bonshawburnhead Quarry, 
Dumfriesshire. 
. B. submucronata; left valve. Whorlton. 
. B. submucronata; right valve. Craigenglen. Fig. 15, ventral view; 
fig. 16, dorsal view; and fig. 17, end view of same. 
. B. submucronata; right valve. Carluke, Lanarkshire, 
PLATE XXX. 
(All the specimens are magnified 25 diameters.) 
Bairdia subelongata, n. sp.; left valve. Woodend Quarry, near Fordel, 
Fife. Fig. 2, dorsal view of the same. 
. B. subelongata; right valve. Ladedda Quarry, Fife. Fig. 4, ven- 
tral view; fig. 5, end view of the same. 
