76 SUPPLEMENT TO THE CRAG MOLLUSCA. 
Natica crrriFoRMIs, Sow. Crag Moll., vol. 1, p. 145, Tab. XVI, fig. 7. 
I only know this shell as a Cor. Crag species. It is given, however, by Mr. Bell 
(Ann. and Mag. Nat. Hist., September, 1870) from the Red Crag of Sutton, and of 
Waldringfield, but I have not seen the specimens. 
Natica muutipunctata, S. Wood. Crag Moll., vol. i, p. 148, Tab. XVI, fig. 9. 
This shell Mr. Bell informed me he had obtained from the Chillesford bed of Easton 
Cliff, but I have not seen the specimen, nor does he give it in either of his lists in the 
‘Ann. and Mag. of Nat. Hist. ;’ personally I only know the species from the Red Crag 
of Walton, Sutton, and Butley, and from the Cor. Crag. 
Narica occnusa, S. Wood. Crag Moll., vol. i, p. 146, Tab. XII, fig. 4, Supplement, 
Mabs IVetoas le 
Localities. Red Crag, Butley. Chillesford bed, Easton Bavent? Upper Glacial, 
Bridlington. 
This species was proposed by me for the Bridlington shell, figured in ‘ Crag Moll.’ 
Since then I have obtained the specimen represented in fig. 11 of ‘ Supplement,’ Tab. 
IV, from the Red Crag at Butley, which appears to resemble JV. occlusa from Bridlington 
very closely, though the spire is not quite so much elevated, but more so than that in JV. 
clausa. J have therefore referred it to the Bridlington species; Mr. Bell gives it from 
Haston Bavent, but I have not seen the specimen. 
Natica caTtena, Da Costa. Crag Moll., vol. i, p. 142, Tab. XVI, fig. 8. 
Localities. Red Crag, Sutton and Butley. Fluvio-marine Crag, Bramerton. Chilles- 
ford bed, Horstead and Coltishall. Lower Glacial Sand, Belaugh. Middle Glacial, 
Billockby and Hopton. Upper Glacial, Bridlington. 
In none of the fossil specimens of this shell that I have seen are there any remains 
of the marks resembling those upon the recent shell. In ‘ Brit. Conch.,’ vol. iv, p. 222; 
is the followimg observation, “The coloured markings of this species (cafena) are not 
exhibited in the Crag shells so named by Mr. Wood, although they are retained in his 
LV. millepunctata”’—a remark that seems to imply a doubt as to the correctness of my 
reference of catena. ‘The cause of this difference I imagine is that the ved spots of the 
one are more durable than the drown chain-like markings of the other, as in the dead or 
beach laid specimens they are generally invisible. ed spots appear to be permanent 
