98 SUPPLEMENT TO THE CRAG MOLLUSC A. 



Groenlandica, 1780. A specimen of the more ovate variety, Cout/ioup, has been obtained 

 from the Red Crag of Butley by Mr. A. Bell, and is represented in the figure in Tab. VI 

 of this 'Supplement.' 



Scalaria varicosa, Lamarck. Crag Moll, p. 90, Tab. VIIT, fig. 14. 



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

 (Bell). 



This shell is evidently the same as S. interrupta, J. Sow., ' Min. Conch./ tab. 577, 

 fig. 3. The specimen there figured is said to have come from the Eocene of Barton Cliff- 

 Mr. E. E. Edwards, whose Eocene collection is unrivalled, tells me that he does not know 

 the shell as an Eocene species, S. interrupta of Dixon's ' Geol. of Sussex ' being obviously 

 a different shell. It is therefore most probable that the specimen figured in 'Min. 

 Conch.' was from the Coralline Crag, the colouring of the figure being that of the Cor. 

 Crag specimens. I should have been disposed to refer the Crag shell to Bwcchi's pumicea, 

 but it does not quite agree with either his or Homes' figure of that species, and I have had 

 no opportunity of comparing the shells themselves. Should it prove distinct then, inasmuch 

 as Lamarck's varicosa is generally regarded as the same as pumicea, I would suggest for 

 our Crag shell the name of Scalaria funiculus. 



Mr. Bell ('Ann. and Mag.,' Sept., 1870) gives the shell from the Red Crag of 

 Walton, Waldringfleld, and Sutton. 



Mr. Jeffreys, in his List to Mr. Prestwich's Coralline Crag Paper, says that Scalaria 

 subulata is a variety of S. foliacea, and this again a variety of frondosa, but in the Red 

 Crag Paper (p. 496) he corrects this and says that subulata is a distinct species, and 

 that Mr. McAndrew had dredged it off Teneriffe. It would seem from this that if a 

 distinct Crag form is found living it is a species, but if not, then it is only a variety. 



Scalaria semicostata, /. Soioerby. 



A specimen of this, since the foregoing ' Supplement' went to press, has been sent to 

 me from the Red Crag by Mr. Charlesworth. Although in the greatest perfection, this 

 specimen can only, I think, be a derivative from the Eocene. I shall figure it in the 

 concluding part of the ' Supplement.' 



Trophon elegans, Charlesworth. 



Very recently the fragment of a shell from the Coralline Crag near Orford has been 

 sent to me by Mr. Cavell, and this, I think, may be referred to Trophon elegans of 



