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SUPPLEMENT TO THE CRAG MOLLUSCA. 



Lepton nitidum, Turton. Supplement, Tab. IX, figs. 7 a, b, c. 



Localities. Cor. Crag, Sutton. Fluvio-marine Crag, Bramerton. Chillesford bed", 

 Aldeby and Beccles. 



The specimen figured in ' Crag Moll.,' vol. ii, Tab. XI, fig. 7, under the above name, 

 is, I now believe, the same as L. depressum, Nyst (fig. 6 of the same Tab.), which I 

 think is distinct from nitidum. I have recently found in the Cor. Crag at Sutton the 

 specimen represented as above, which I have no doubt is the shell called nitidum by 

 Turton, and Mr. Canham showed me a similar one from the same locality. A 

 specimen was sent to me by Mr. Reeve from Bramerton, and Messrs. Crowfoot and 

 Dawson have sent one from Aldeby and several from the Waterworks AVell at 

 Beccles, which may be referred to the same species. These latter are from the Chilles- 

 ford bed. 



Lepton deltoideum, S. Wood. Crag Moll., vol. ii, p. 115, Tab. XI, fig. 9. 

 Localities. As in ' Crag Moll.' 



This shell is given by Dr. Homes ('Vienna Foss./ p. 249, and by M. Weinkauff, 

 'Conch, des Mitt./ p. 178) as a synonym to Bornia corbuloides, but that shell has a 

 smooth exterior, while the Crag shell is covered with a kind of wavy granular ornament. 

 Mr. Jeffreys, in his list to Mr. Prestwich's paper, ' Geol. Journ.,' vol. xxvii, p. 139, 

 referred the Crag shell {deltoideum) to Erycina Geoffroyi, Payr. He has since, however, 

 written me that he was in error in so doing, and that he now considers the shell to be 

 identical with corbuloides ; he also sent me two specimens of that species for comparison. 

 These proved to be entirely destitute of any external ornament, the presence of which is 

 so marked a characteristic of the Crag deltoideum. Under these circumstances I have 

 retained my Crag shell as a distinct species. The specimens from the Red Crag are 

 slightly worn, but the ornament may be detected by means of a lens ; these have a slight 

 depression in the central part of each valve. 



LASiEA Clarke, Clark. Supplement, Tab. IX, fig. 10. 



Leptox Clahki/E, Clark. Ann. Nat. Hist., 2nd ser., 1852, p. 293, and vol. ix, p. 191. 



— — Forbes and Hani. Brit. Moll., vol. vi, p. 255, pi. cxxxii, fig. 7. 



— — Jeffreys, Brit. Conch., vol. ii, p. 202, pi. xxxi, fig. 5. 



Locality. Cor. Crag, Sutton. 



Lenyt/t, of an inch ; heiyht, inch. 



