GASTEROPODA. 97 



to be one of B. ventricosa, so that buccinea is not known from any newer deposit than 

 the Red Crag, in which, moreover, it is extremely rare, and may, even in that Crag, be 

 only derivative from the Coralline. 



Ringicula ventricosa, /. Sow. Crag Moll., vol. i, p. 22, Tab. IV, fig. 1. 



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

 Crag, Bramerton (Woodward), Yarn Hill (Fisher). Chillesford bed, Aldeby (Crowfoot 

 and Dowson). 



In the ' Crag Mollusca ' Bingicula was placed in the section Solenostomata of Fleming 

 (Canalifera, Lam.), depending upon the peculiar construction of the shell. Recent 

 observations have removed it near to Actaon, in which position I have here placed it in 

 deference to the Malacologists. It is, however, of a very aberrant character, possessing 

 as it does a deep siphonal canal, very unlike its present associates. B. ventricosa still 

 remains very rare in the Coralline Crag. 



Since my communication in 1870 to the ' Ann. and Mag. of Nat. Hist.,' respecting the 

 peculiarity of the Crag shells of this genus, I have found more than a hundred other 

 specimens of B. buccinea, all in the presumed full-grown condition, that is, with a thickened 

 outer lip. Of course this outer lip, while the animal is growing, must necessarily have a 

 plain or simple margin, but the peculiarity is that it has so rarelv 1 died in that condition 

 I had imagined, and do so still, that these animals, as also those of Trivia, completed their 

 shell in anticipation of their decease, and that many of the small specimens we find 

 are young individuals that have thus assumed the adult form. 



Rissoa abyssicola ? Forbes. Supplement, Tab. VII, fig. 2. 



Eissoa abyssicola, Forbes. Brit. Moll., vol. iii, p. 86, pi. Ixxviii, figs. 1, 2. 



Locality. Cor. Crag, Sutton. Living Britain, Scandinavia, and Mediterranean. 

 A single specimen which I have quite recently found in the Cor. Crag of Sutton is 

 shown in the above figure. It may, I think, be referred to abyssicola of Forbes. 



Cancellaria viridula, Fab. Crag Moll., vol. i, p. 66, Tab. VII, fig. 21, as 



C. costellifer. 



Cancellable viridula, var. Couthouyi. Supplement, Tab. VI, fig. 12. 



This species is now considered to be the Tritonium viridulum of Fabricius' Fauna 



1 I, indeed, doubt whether a perfect specimen without the thickened lip has occurred in the Crag ; the 

 few such that I possess appear all of them to have had the thickened lip broken off. 



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