68 
Miss E. Benett of Norton House favoured me with this, 
specimen from the green sand formation in the parish of 
St. Mary Donhead, Wiltshire. Miss B. remarks that the 
upper valves are seldom found, although from Dinton, 
near Salisbury, to Stourhead, the deeper or lower shells of 
various Chame are predominant. 
The shells are siliceous casts, and belong to the green 
sand formation. 
CHAMA canaliculata. 
TAB. XXVI.—Fig. 1. 
Spec. Cuar. Oblong-oval, flattish, plated; deeper 
valve with a lateral canaliculated projection, or 
wing. 
a 
Lenern an inch and a quarter; breadth, exclusive of the 
beak, one inch. The beak of the deeper valve is much 
curved towards the wing, but partly obliterated by the 
surface of adhesion. The beak of the other valve is very 
short, it has scarcely any wing; the margins of the dif- 
ferent stages of growth cover the shells like deep folds of 
drapery. The surface of adhesion is between the wing 
and the beak of the deeper valve. 
I could not separate the valves, so I judge from the 
outside appearance alone, that this belongs to the Genus 
Chama. It is siliceous, and accompanied by the green 
sand; found in a field at Chute, Wiltshire. 
