52 



MEMORANDUM. 



The following species, all contained in my original synoptical list, have also 

 since occurred in beds represented in its columns beyond what is there shown. 



In the Ebd Ckag op Sutton and Butley. — Nassa conglohata. A solitary specimen 

 found at Walton thirty-five years ago by Mr. Charlesworth, and in my collection in 

 the British Museum, was the only instance of this shell known to me until lately. 

 In Mr. Canham's collection, however, I observed a specimen from the Red Crag of 

 Sutton ; and it seems to me, therefore, that although it has not yet occurred in the 

 Coralline Crag, this shell is properly a species of that Crag, and not of the Red, 

 and is only present in the latter (albeit that it has occurred at Walton) by 

 derivation from the CoralUne. 



In the Chillesford beds. — Gardita corhis and Ahra prismatica. Mr, Dowson 

 informs me that he has found several specimens of these shells at Aldeby. 



In the Lowee Glacial. — From a fossiliferous seam in the pebbly sands near 

 Southwold Mr. Crowfoot has obtained several of the species given in my original 

 list from these sands in Norfolk, and in addition CeritJiium tricinctum, Melampus 

 (Conovulus) pyramidalis, and Donax vittatus. Perfect specimens also of the latter 

 from Belaugh and Weybourn are in my cabinet. An imperfect specimen of 

 Gardium in my cabinet from Belaugh seems referable to Gardium Islandicum, 

 but no reliance can be placed upon such fragments, either in this or other beds, for 

 specific determination. Similarly, the fragments upon which the name of G. Oroen- 

 landicum is inserted in the list of shells given by Mr. C. Reid from these sands 

 where they underlie the Till along the Cromer coast (in the ' Geological Magazine ' 

 for July, 1877), are equally unreliable, and might be referred to more than one 

 large species of Gardium. Whether Islandicum or Groenlandicum, the Belaugh 

 and Cromer fragments are probably those of the same species only, and would 

 answer as well for the one as for the other of these shells. Mr. Crowfoot also 



