advantage. The collections of these gentlemen now contain above seventy species from this bed ; and I am indebted to them for the following list * : —
List of Shells found at Aldeby by Mr. W. M. Crowfoot and Mr. E. T. Dowson.
c. common, r. rare. fr. fragments. vc. very common. vr. very rare. nc. not common. For one or two specimens numerals are given.
Bivalves.
Abra alba ? vr
— prismatica r
Anomia aculeata r
— ephippium r
— striata r
Astarte borealis r
— compressa, 2 vars. v c
— sulcata v c
Cardium edule c
— groenlandicum v r
— nodosum r
— strigilliferum ? v r
Cochlodesma complanatum r
Corbula striata v c
Cryptodon sinuosum v r
Cultellus pellucidus r
Cyprina islandica v c
Donax vittatus c
Kellia ambigua l
Leda limatula c
— pygmaea (Bell) 1
Lepton nitidum r
Loripes divaricatus v r
Lucina borealis v c
Lucinopsis undata v r
Mactra ovalis v c
— solida r
— subtruncata v r
Modiola modiolus v r
Montacuta bidentata r
— ferruginosa r
— substriata v r
Mya arenaria v c
— truncata r
Mytilus edulis c
Nucula Cobboldiae c
— tenuis n c
Pecten tigrinus n c
— opercularis n c
Pectunculus glycymeris?, worn 1
Saxicava rugosa and var c
Solen siliqua ?, fragment v r
Tellina fabula 1
— lata v c
— obliqua v c
— praetenuis c
Thracia phaseolina n c
Venus ovata v c
Univalves.
Actaeon tornatilis r
Bulla regulbiensis v r
— truncata v r
Calyptraea chinensis r
Capulus ungaricus, var. 1
Cerithium tricinctum 1
Chemnitzia — ?, fragment l
Clavatula linearis v r
— turricula c
Hydrobia ulvae ? v r
Littorina littorea r
Natica clausa v c
— helicoides r
Purpura lapillus r
Ringicula buccinea v r
— ventricosa v r
Scalaria groenlandica r
Trevelyana r
Trochus tumidus c
Trophon antiquum r
Turritella communis v r
Balanus crenatus
— porcatus
As the pit is a small one, and the sands are only occasionally excavated, it is easy to see how rich and promising the locality is. In the shell-bed a few Mammalian remains have been found, including tooth and part of antler of Deer, teeth and bones of small Rodent, vertebrae of Whale, together with bones and vertebrae of Fish, otolites, spines of Echini, Foraminifera and Bryozoa.
There are no Crag-pits between Aldeby and the neighbourhood of Norwich, where we have the well-known sections of Thorpe,
- In this list, as well as in that of Mr. Reeve, the greater part of the species
have been, I understand, determined by Mr. Searles Wood.
