COMMUNICATION 
TO THE 
MONTHLY M E E T IN O 
OP THE 
YORKSHIEE PHILOSOPHICAL SOCIETY, 
1884. 
On tlie occurrence of Waldheimia Berna} dina in the Oxford 
r 
Clay of Cambridgeshire, by John Francis Walker, M.A., 
F.O.S. 
Some years ago, my friend C. E. Leeds, M.A., gave me a 
specimen of a Waldheimia from the Oxford Clay of Thorney, 
North Cambridgeshire. It had the usual black glossy appear¬ 
ance of the brachiopoda found in the Oxford Clay of Hunting¬ 
donshire, but it differed from the typical, JF. impressa found at 
St. Ives, in being a larger flatter shell, of a more elongated 
form, having its greatest width near the middle of the shell, 
tapering towards the beak, which is longer and less incurved 
than that of Waldheimia unpressa. Fine specimens of this 
species are preserved in the Museum of the Yorkshire Philo¬ 
sophical Society, having formed part of the Wood collection 
which was purchased and presented to the Society by W. 
Peed, F.C.S. 
Terehratula (Waldheima) impressa was first figured by Zieten 
(Yersteinerungen Wiirtembergs, tab. 39, fig. 11) in 1832. It 
was obtained from the bluish marl between the Jm’akalk at the 
Unter-oolith from Stuifenburg ; this bed was afterwards called 
the Impressa-thon. Therefore we must consider the Cerman 
specimens as the typical form, these shells are circular, and 
have the beak well incurved. 
