﻿BIVALVIA. 



147 



Donax politus, Poll Crag Moll., vol. ii, p. 220, Tab. XXII, fig. 9. 



Localities. Cor. Crag, Sutton and Gedgrave. Red Crag, Walton (A. Bell), and 

 Sutton. 



Mr. Bell gives this shell ('Ann and Mag. Nat. Hist.,' 1871) from the Red Crag of 

 Walton and Sutton, and I have myself a specimen from the latter locality. At the time 

 of the publication of the ' Crag Mollusca ' I had only seen it from the Cor. Crag. 



Psammobia costulata, Turton. Supplement Tab. X, fig. 7. 



Psammobia costulata, Turt. Conch. Dith., p. 87, tab. vi, fig. 8. 

 Locality. Coralline Crag, Sutton. 



In 'Brit. Conch./ vol. ii, p. 395, the author says, "I observed a specimen (of this 

 species) in Mr. Searles Wood's collection in the Brit. Museum. 5 ' I have here had the 

 specimen in question figured, and the radiating lines, similar to those which distinguish 

 the recent costulata, are very apparent ; but the form of the fossil does not accurately 

 agree with that of the recent shell, and I am not satisfied that it is the same species. 

 Should further specimens turn up which present the same difference in form from the 

 recent shell, I should propose for the Crag shell the name pseudo-costulata. 



Psammobia tellinella. Crag Moll., vol. ii, p. 223, Tab. XXII, fig. 4. 

 Locality. Cor. Crag, Sutton. 



Perfect specimens of this shell are very rare with me, but I have met with fragments 

 indicating a length of more than an inch, which seems somewhat to exceed that of the 

 British shell of this name, and it is rather more elongated and less tumid. It appears to 

 me more to resemble the Touraine shell called Psam. affinis, Dujardin (' Mem. Geol. Soc. 

 Fr.,' torn, ii, pt. ii, p. 257, PI. XXVIII, fig. 4), but I have not been able to obtain a 

 specimen of that fossil for comparison, and I have left it for the present with its original 

 name. I have seen the Crag shell only from the Cor. Crag of Sutton. 



Solecurtus stri gill ati] s, Linne. Crag Moll., vol. ii, p. 252, Tab. XXV, fig. 3 (as 



Macha strigillata). 



Localities. Cor. Crag, Sutton. 



This Mediterranean shell is regarded as distinct from the British one called candidus, 

 but I can discover no difference between them except in size and colour, and as stated in 

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