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SUPPLEMENT TO THE CRAG MOLLUSCA. 



deposit is the only one among the Upper Tertiaries of the East of England in which it 

 has for certainty occurred. It is, I believe, abundant in the deposit at Selsey, and in that 

 near Belfast, and in the Clyde beds. 



Venerupis Irus, Linn. Crag Moll., vol. ii, p. 205, Tab. XIX, fig. 6 a — b. 

 Localities. Cor. Crag, Sutton. Red Crag, Walton. 



I have recently found a fragment of this shell in the Cor. Crag of Sutton, having 

 known it previously only from the Red Crag of Walton. Venerupis Irus so much 

 resembles the genus Tapes in every respect that I believe it belongs to the Venerida and 

 not to the Saxicavidce. 



Gastrana laminosa, /. Soto. Crag. Moll., vol. ii, p. 217, Tab. XXV, fig. 1. 

 Localities. As in ' Crag. Moll.' 



This is (or was) not very rare either in the Cor. Crag of Orford and Sutton or in the 

 Red Crag at Walton Naze and Sutton, but I do not know whether it extended its existence 

 into the Butley Crag. The South African shell, called Petricola ventricosa, Krauss, ' Sud. 

 Afrikan. Mollusk,' very much resembles our species, and seems to be its representative in 

 the southern hemisphere in the same manner as many Australian marine shells are said to 

 be identical with those in Europe. Tellina Guinaca, Chemn., vol. x, p. 346, tab. 

 170, figs. 1651-3, a species from Tranquebar, is another shell that can scarcely be removed 

 from our Crag species. Gastrana laminosa is given as Fragilia laminosa by Mr. Jeffreys 

 in his list accompanying Mr. Prestwich's Cor. Crag paper, p. 139. 



Donax vtttatus, Da Costa. Crag Moll., vol. ii, p. 219, Tab. XXII, fig. 7. 



Localities. Fluvio-marine Crag, Bulchamp, Postwick, and Brainerton ? Chillesford 

 bed, Horsted and Aldeby. Lower Glacial, Belaugh. 



In the 'Crag Mollusca' this shell is given from the Crag of Brainerton, but Mr. 

 Reeve does not appear to have detected it there. It is, however, given by the late Dr. 

 Woodward in his list in White's ' Directory ' as from Bulchamp and Postwick as well as 

 Brainerton. If it be thus present in the Fluvio-marine Crag it is another of the few shells 

 that, on the hypothesis of the Red and Fluvio-marine Crags being coeval, ought to occur 

 in the Red Crag, but which has not yet been detected there. I have found this species 

 myself at Horsted and Belaugh, and it was sent to me from Aldeby by Messrs. Dowson 

 and Crowfoot. 



