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