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BIVALVIA. 117 



variety) was for many years almost unique in the Fluvio-marine Crag, but it has been 

 found somewhat plentifully in a newly worked pit at Bramerton. A single worn 

 specimen of small size, found by Messrs. Crowfoot and Dowson, is the only instance of 

 its occurrence in the Chillesford Bed. It has not occurred in the Lower Glacial sands, 

 but it abounds in the Middle Glacial, both at Billockby and Hopton, where specimens of 

 all sizes occur, from the smallest fry up to the ordinary size of the British shell. I have 

 not seen even a fragment from that formation of those larger or more solid forms occurring 

 in the Cor. and Red Crags. 



Fig. 1 d of Tab. IX of ' Crag Moll.' corresponds with what Brocchi has called a species 

 under the name of A. inflata, and Mr. A. Bell gives P. insubricus, Broc. {violascens, 

 Lam.), also as in Cor. Crag. Some specimens which I have seen that somewhat resemble 

 these so-called species are, I believe, only varieties. Mr. Jeffreys, in his list of the Crag 

 shells, gives glycimeris only from the Cor. Crag, but introduces P. pilosus as a new Red 

 Crag shell. If these be really two distinct species I would rather reverse this determina- 

 tion, and while giving pilosus to the Cor. Crag, regard that form as only derivative in 

 the Red. 



Limopsis PYGMiEA, Phil. Crag Moll., vol. ii, p. 71, Tab. IX, fig. 3. 



Localities. Cor. Crag, Sutton, and near Orford. Red Crag, Walton, Waldringfield, 

 and Felixstow. Middle Glacial, Billockby. 



This shell, according to M. Meyer ('Cat. Syst. Ter.,' p. 120), is Trigonocalia anomala, 

 Eichwald, 1830, not p?///mceus, Munster, and, according to Mr. Jeffreys, it has recently 

 been dredged living near Corsica, and in abysmal depths in the Atlantic. Mr. Bell gives 

 the species as occurring at Walton (' Ann. and Mag. Nat. Hist.,' 1870), also from Wal- 

 dringfield and Felixstow. A single perfect valve has occurred in the Middle Glacial sand 

 of Billockby. It is a most abundant shell in the Cor. Crag of Sutton, where the two 

 valves are frequently united. 



Limopsis aurita, Brocchi. Crag Moll., vol. ii, p. 70, Tab. IX, fig. 2. 



This shell is very abundant in the Cor. Crag, near Orford, but I have never found it 

 in the Red Crag, with one doubtful exception. Mr. Jeffreys gives it in his list from the 

 Red Crag at Waldringfield (I presume on Mr. Bell's authority). This is given by Mr 

 Jeffreys as a shell living in the Shetland seas, and though no uncommon fossil in the 

 Italian beds, it has not, I believe, been yet found living in the Mediterranean. 



