GASTEROPODA. 75 



N. Alderi has been found at Yarn Hill by Mr. Crowfoot. I have seen a fine specimen 

 found by Mr. Harmer at March, and it is given (under the name nitida) by Mr. Jeffreys 

 from Kelsea Hill. Since my plate has been engraved I have found a specimen of this 

 species in the Coralline Crag of Gedgrave. 



Natica clausa. Crag Moll., vol. i, p. 147, Tab. XVI, fig. 2. 



Localities. Red Crag, Sutton and Butley. Fluvio-marine Crag, Bramerton. Chilles- 

 ford bed, Aldeby, and Horsted. Lower Glacial, Rackheath. Middle Glacial, Hopton, 

 and Billockby. Upper Glacial, Bridlington. Post Glacial, Kelsea Hill. 



Specimens of this species have been now obtained from all the above formations. It 

 is not uncommon in the Middle Glacial, but the specimens are all young shells. It 

 seems the reverse of common in all the formations prior to the Middle Glacial. It is 

 given from Kelsea Hill by Mr. Jeffreys. 



Natica Grcenlandica, Beck. Crag Moll., vol. i, p. 146, Tab. XII, fig. 5. 



Localities. Red Crag, Butley. Fluvio-marine Crag, Bramerton, and Thorpe in 

 Suffolk. Chillesford bed, Chillesford. Upper Glacial, Bridlington. Post Glacial, 

 Kelsea Hill. 



Since the publication of the ' Crag Moll.,' I have myself found this shell at Butley 

 and Chillesford. It has been found by Mr. Reeve in the Fluvio-marine Crag, Bramerton, 

 and is given by Mr. A. Bell from that of Thorpe in Suffolk. 



Mr. Jeffreys gives it from Kelsea Hill. It appears to me that the N. lorealis 

 of Mr. A. Bell's list in the ' Ann. and Mag. Nat. Hist.' for May, 1871, is N. Grcenlandica, 

 Beck. 



Natica HEMiCLArsA, Sow. Crag Moll., vol. i, p. 144, Tab. XIV, fig. 5. 



Localities. Red Crag, Walton, Sutton, and Butley. Chillesford bed, Easton ? 



In my Monograph I gave this shell from Walton and Sutton, and I have since found 

 it at Butley. Mr. A. Bell informed me that he had observed it at Easton Cliff, but he has 

 not so given it in either of his lists in the ' Ann. and Mag. of Nat. Hist.' Dr. Woodward 

 gives it in his list (in ' White's Directory ') as common at Norwich, but I have not met 

 with an instance of its occurrence in that neighbourhood. 



