GASTEROPODA. 



Voluta luctatrix, Solander. Supplement, Tab. VI, fig. 14. 



Locality. Red Crag, Waldringfield. 



Another extraneous specimen has been obtained by Mr. Canham from the same place, 

 which I have referred to the young state of Voluta luctatrix. Our shell corresponds with 

 fig. 3, d, e, Tab. XIX, of ' Eocene Mollusca ;' it is rather less in size, but I have no doubt of 

 its identity ; the specimen has undergone a good deal of rough treatment by its removal 

 into the bed of the Red Crag. This species {luctatrix) is very abundant at Barton, 

 where specimens of all ages and sizes may be found, from 4^ inches down to fths of an 

 inch, and the young species vary much in shape, being comparatively more elongated 

 than when full grown. Perfect specimens have a small apex or pullus, and two or three 

 of the upper volutions are smooth, or free from ornament of any kind, like the pullus of 

 true Voluta, with its very obtuse apex. Swainson proposed for these Eocene fossils with 

 a small apex the term Volutilites, but this is a name of hybrid composition, and does not 

 appear to be generally adopted. This Eocene form of Volute has nearly died out. One 

 shell of this character has been obtained from the Aguilhas Bank, and named V. abyssicola, 

 which is probably a true descendant of ne of our Eocene species. 



Voluta Lamberti, /. Soiverby. Cra-. Moll., vol. i, p. 20, Tab. II, fig. 3. 



Localities. Cor. Crag passim. Red Crag passim. Eluvio-marine Crag, Yarn Hill, 

 near South wold. 



In the ' Crag Mollusca ' I regarded the presence of this shell in the Red Crag as due 

 to derivation from the Coralline, but there can, I think, be now no reason for doubting 

 that the shell was a denizen of the Red Crag sea, because it was lately found by Mr. 

 Charlesworth and Mr. V. Colchester in association with Pecten princeps in the pit at 

 Yarn Hill, near Potter's Bridge, Southwold, which belongs either to the Fluvio-marine 

 Crag or the Chillesford bed (though to which it is hard to say). There can, therefore, be 

 no doubt that it lived through the Red and Fluvio-marine Crag period. There is no 

 known living shell with which it can in my opinion be identified. 



Mitra ebenus? var. uniplicatus, S. Wood. Supplement, Tab. Ill, fig. 6. 



Locality. Coralline Crag, Orford. Red Crag, Waldringfield [A. Bell). 



When I first obtained the above represented specimen, I had it figured under an 

 impression that it was a distinct species (or even genus), having but one fold or ridge 

 upon the columella, but I have since seen two or three more specimens in Mr. Bell's 



