GASTEROPODA, 81 



Trochus tumidtjs, Mont. Crag Moll., vol. i, p. 130, Tab. XIV, fig. 2. 



Localities. Red Crag, Sutton. Fluvio-marine Crag, Bramerton. Chillesford bed, 

 Bramerton, and Aldeby. 



This shell has been found by Mr. Reeve in the Chillesford bed at Bramerton, as well 

 as in the Fluvio-marine Crag below, and by Messrs. Crowfoot and Dowson at Aldeby. 



Trochus zizyphinus, Linne'. Crag Moll., vol. i, p. 124, Tab. XIII, fig. 9. 



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

 Fluvio-marine Crag, Bramerton. Middle Glacial, Hopton? 



This species is given in Dr. Woodward's Nor. Crag list in ' White's Directory,' but 

 I have not myself seen it from that Crag. Fragments of a large, finely striated Trochus 

 are common in the Middle Glacial sand of Hopton, which, there can be little doubt, are 

 of this species. 



Trochus cineraritjs, Linne. Crag Moll, vol. i, p. 131, Tab. XIV, fig. 7. 



Localities. Red Crag, Walton and Sutton. Middle Glacial, Hopton. Post Glacial, 

 March. 



I have not met with any certain trace of this shell in the Fluvio-marine Crag or at any 

 of the localities of the Chillesford bed, at which I am somewhat surprised. One tolerably 

 perfect specimen and several imperfect have occurred in the Middle Glacial sand of 

 Hopton, and I have it from the March Gravel. Some very injured apices of a Trochus 

 sent me from Bramerton may not improbably belong to this shell, but they are not 

 sufficient to justify my inserting it from that locality. 



Trochus noduliferens, 8. Wood. Crag. Moll., vol. i, p. 126, Tab. XIII, fig. 6 (as 



T. papillosus) ; and Supplement, Tab. V, fig. 14. 



Trochus gkanosus, S. Wood. Catalogue, 1842. 



— papillosus, Da Costa. Crag. Mollusca, vol. i, p. 126. 



Localities. As in ' Crag Moll.' and Fluvio-marine Crag, Bramerton and Thorpe ? 

 Middle Glacial, Hopton ? 



In speaking of this shell in the ' Crag Mollusca ' I pointed out the differences which 

 existed between it and the recent papillosus, Da Costa {gramdatus, Born), but I did not 

 consider that they justified my referring it to a distinct species. The author of the ' Brit. 

 11 



