Page:Quarterly Journal of the Geological Society of London, vol. 27.djvu/473



Buccinum undatum.

Cancellaria costellifera.

Calyptraea chinensis.

Littorina littorea.

Natica.

Nassa granulata.

— propinqua.

— reticosa.

Purpura lapillus.

— tetragona.

Ringicula buccinea.

Trophon antiquum.

— costiferum.

— gracile.

Trochus granulatus.

— papillosus.

Turritella incrassata.

Voluta Lamberti.

Balanus crenatus.

The following is a list of shells furnished me by the late Dr. Woodward, by whom they were collected at Chillesford Stack-pit in 1863. The distance between the pits is one mile ; and they are both on the same level. Even in this short distance the distribution shows a marked difference *. Some species rare or absent in the last pit are common in this one : —

From the Chillesford Stack-pit.

Astarte Omalii. Tellina obliqua (common).

Cardium angustatum (common). — praetenuis (common).

— edule. — Buccinum undatum.

— venustum. — Littorina littorea.

Mactra arcuata (common). — Natica catena.

— ovalis (common). — clausa.

— subtruncata. — multipunctata.

Mya truncata. Purpura tetragona.

Mytilus edulis. Trophon antiquum.

Nucula Cobboldife. , — —, var. contraria.

Pecten opereularis. — gracile.

Pectunculus glycymeris (common). Turritella inerassata.

Tellina crassa.

To these I may add —

Leda myalis. Nassa reticosa.

The following is also on the same authority : —

From a pit at Hollesley.

Cardium angustatum. Cerithium.

— edule (frag.). Nassa granulata.

Mactra. — reticosa (common).

Mya arenaria. Natica.

Pecten. Purpura lapillus.

Pectunculus glycymeris. Trophon antiquum.

Tellina praetenuis (pair). — —, var. contraria.

Buccinum tenerum. — gracile.

Capulus ungaricus. Turritella inerassata.

Between Chillesford and Aldborough a range of hills consisting of a ridge of Coralline Crag, against both flanks of which the Red Crag abuts, runs from Orford to Iken. On the eastern side of this ridge there is on the whole a greater paucity of species. In one pit

or are at all events extremely rare.
 * Tellina, so very abundant generally in the Crag, do not occur at Walton,