211, fig. 45, and is assumed by Gmelin, as Anomia spondylodes. The other shells, fig. 46, of the same plate, referred to by Gmelin as Anomia psittacca, appear to be mutilated specimens of the same shell. This opinion is corroborated, by the tint given by the accurate artists, to the whole of the shells contained in this plate, agreeing with the dark colour of the Essex fossil; and by the circumstance of their being generally found in the mutilated state in which they are here figured by Lister. Besides, neither of Lister's specimens at all agrees with the pellucid shell, with triangular foramen, of Anomia psittacca, but they all agree with the oval antiquated shell, with an obtuse canaliculated beak, of Anomia splondylodes.
In consequence of this agreement, it seems proper to consider this fossil shell as forming the species, Anomia splondylodes. But as the channelled beak is not natural to it, but is the consequence of injury; and as this part, in its natural state, is pierced with a large round foramen, a correspondent change should be made in the description, and it may be placed under the more appropriate genus of terebratula, as, Terebratula spondylodes, with an oval antiquated shell, the beak pierced by a large round foramen.
This shell is, in general, about an inch and a half long, thick, nearly oval, roughly striated transversely, and has its large foramen defined by a distinct border. It appears to differ from every known recent or fossil terebratula.
Another of the probably lost shells of this stratum is the fossil oyster, figured Organic Remains, &c. vol. III. pl. XIV. fig. 3, and which is there conjectured to be the same oyster as that which is described by Lamarck as Ortrea deformis.
The volute, Organic Remains, vol. III. pl. V. fig. 13. is another shell belonging to this stratum, of which it is believed that no recent analogue has been yet found. This ovate and rather fusiform
