GASTEROPODA. 93 



Dentalium abyssorum, Sars. Crag. Moll, vol. i, p. 189, Tab. 20, fig. 2 (as D. entale). 



Locality. Upper Glacial, Bridlington. 



The shell figured and described by me from Bridlington appears to belong to the 

 arctic and deep water species or variety, abyssorum. 



Dentalium dentalis, Linn. Crag Moll., vol. i, p. 188, Tab. XX, fig. 1 (as 



D. costatum). 



Dentalidm costatum, J. Sow. Min. Con., t. 70, fig. 8, 1814. 



Localities. Cor. Crag, Sutton, and near Orford. Red Crag, Sutton. Middle 

 Glacial, Billockby. 



In the 'Crag Moll.' (vol. i, p. 189) I mentioned that I thought this Crag shell the 

 same as the living Mediterranean shell, D. dentalis, Linn., and as this seems now the 

 general opinion, I have here placed it under Linne's name. Two imperfect specimens, 

 showing the strong costse, but flattened by wear, have occurred in the Middle Glacial of 

 Billockby, and I have no doubt of their belonging to this species. 



Action no^:, /. Sow. Crag Moll., vol. i, p. 169, Tab. XIX, fig. 6. 



Localities. Red Crag, Walton, Brightwell, Newbourn, Bntley. Fluvio-marine 

 Crag near Norwich ? 



This shell is given by S. "Woodward, in his 'Geology of Norfolk' (1833), as occurring 

 rarely near Norwich, but his son Dr. Woodward, in his list in ' White's Directory,' treats this 

 as a mistake for Actceon {Tornatella) tornatilis, which also occurs in the Fluvio-marine Crag 

 of Bramerton. I however find that Actaon Noa was among a set of shells from Norwich 

 submitted to me and the late G. B. Sowerby by Sir Chas. Lyell, and published at p. 328 

 of vol. Ill of the ' Mag. of Nat. Hist./ New Series, which were by us carefully compared 

 and considered. Therefore, although I have not since met with the shell from the 

 Fluvio-marine Crag, I give it from that Crag with a doubt. Mr. Jeffreys has stated, 

 ' Quart. Journ. Geol. Sci.,' vol. xxvi, p. 283, that this shell has been found fossil in 

 Iceland by Prof. Steenstrup. Dr. O. Morch also gives this species in his list of Crag 

 Shells ('Geol. Mag.,' vol. viii, p. 395), from Hallbjarnastadir, in Iceland. 



Action tornatilis, Linn. Crag Moll., vol. i, p. 170, Tab. XIX, fig. 5. 



Localities. Cor. Crag, Sutton. Red Crag, Sutton and Butley. Fluvio-marine Crag, 

 Bramerton. Chillesford bed, Burgh and Aldeby. 



