96 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Dec. 8, 
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Name of the Shell. 6 2 : eel Remarks. 
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Hizi f,A 
Tellina pratenuis, Leathes ...... * * O. Profuse in Red and Fluyvio-marine 
crag and Chillesford beds. Rare 
in. Lower Glacial. 
balthica, Linn, ........0..006- *|*| » |...) B, A, 8. | Profuse in Lower and Middle 
Glacial, and in all Glacial and 
Postglacial beds. 
crassa, Gmelin ...........006 ...{% | ... || B,S. | Common in Crag, and fragments. 
Common in Middle Glacial. 
Donax vittatus, Dacosta ......... S2 lool soon |Pesi| Bh ts 
Scrobicularia plana, Dacosta ...)*|*| ... |x| B,S. | S. piperata, Gmel. Hinge-frag- 
ments common in Middle Gla- 
cial. 
Mactra ovalis, Sow. ......sssecees- x|*| * | |B, A,S. | JL eddiptica of British authors. 
—— subtruncata, Dacosta ...... ..[*] ... |x| B,S. | «Bradwell. 6 
——— solid a, LAN... oc0ccsneeroees- soall & x| B,S Doubtful fragments only, in Mid- 
dle Glacial. 
Thracia papyracea, Polt ......... x|...| ... |*| B,S. | One perfect specimen from Lower 
Glacial. 
Mya truncata, Linn. .........66 x|?| x |x] B,A,S. 
—— arenaria, Linn. ce.0..seees x|x] *« |x|] B, A,S. 
Panopza norvegica, Spengl. ...)...|...) * |*| B,A. 
Saxicava rugosa, Linn. ............ x|x|]... |*] B, A, S. 
arctica, Linn. .......0--1.00- Selec fies sie lacel lees The gigantic form of Uddevalla 
and the Clyde beds. 
Pholas crispata, Li. ........006 xi|x| « |x| BA. 
Corbula striata, Walk. § B....... % | * x| B. C. gibba, Oliv. Profuse in Coralline 
and Fluvio-marine Crags, Chil- 
lesford bed and Lower Glacial. 
Common in Middle Glacial. 
Rare in Red Crag. 
Note.—O, P signifies that the form is extinct unless represented by a Pacific shell; O, . 
not known living; N. A, occurs no nearer than North-east America; A, only within the 
Arctic Circle; 8, only to the south of the British Seas; B, A,S, in British, Arctic, and 
Southern Seas; B, A, in British and Arctic Seas only; B, in British Seas only, the Norway 
coast being included under this letter. The shells marked x Bradwell are inserted in the 
Middle-Glacial column on the authority of a list of identifications made by Mr. G 
Jeffreys of some shells and fragments obtained by Mr. G. B. Rose from the Middle-Glacial 
cutting of Bradwell (by Breydon), supplied by Mr. Rose. 
N.B. In the foregoing list the Crag column embraces all the divisions of that formation 
from the Coralline Crag up to, and inclusive of, the Chillesford beds. 
SUMMARY. 
O. |O, P.| B,S. |B, A.|B,A,S.) B. | S. | A. |N.A.| Total. 
Lower-Glacial Shells ......... 2 1 5 3 15 
2: |") 36.) aL 35 
Middle: ditto 22.50 seecaeer 13 | 2 19 4} 15 38/ 2) 5| — | 63 
Upper ditto (Bridlington)..) 5 | 1 4/ 15] ll 5|—| 28} 1 70 
N.B. In the case of the Middle-Glacial shells, the number in column O is swelled by 
the two new shells and by two marked with ? being included in it. 
