GASTEROPODA. 63 
Opostomta conorpEA, Brocchi. Crag Moll., vol. i, p. 85, Tab. IX, fig. 3 a (as 
O. plicata). 
Opostomra conorpEA, Broce. Conch. Foss. Sub-ap., p. 660, c. 16, fig. 2. 
Localities. Cor. Crag, Sutton, Ramsholt, and near Orford. Red Crag, Walton ? 
Fluvio-marine Crag, Bramerton? Middle Glacial, Billockby ? 
This shell was in the ‘Crag Moll.’ referred by me to O. plicata of Mont. with O. 
conoidea, Broc., as a synonym. ‘The two, however, appear to be, as stated p. 317 of 
Appendix, distinct. 0. conoidea is given by Mr. Bell from Walton in ‘ Ann. and Mag. 
Nat. Hist.,’ September, 1870, but I have not seen the specimen. ‘This is the only Red 
Crag occurrence of it of which | am aware. An imperfect specimen obtained by Mr. 
Reeve from the Fluvio-marine Crag of Bramerton, and another by my son from the 
Middle Glacial sand of Billockby, appear to belong to this species, but they are not 
sufficiently perfect for certain identification. 
Opostomia piicata, Mont. Supplement, Tab. IV, fig. 22. 
TurBo piicatus, Mont. Test. Brit., p. 325, tab. xxi, fig. 2. 
Localities. Cor. Crag, Sutton. Red Crag. 
A single specimen of this shell, which has been obtained by me from the Coralline 
Crag at Sutton, and is represented in the above figure, enables me to retain the name of 
Montagu’s species as a Cor. Crag shell, as mentioned p. 317 (Od. plicata) of Appendix. 
I had it from the Red Crag, but the name of the locality has not been preserved. 
Opostomia conspicua ? Alder. Crag. Moll., vol. i, p. 85, Tab. IX, fig. 3 (as 
O. plicata, var.). 
Opostomia conspicua, Alder. Trans. Tynes Nat. Field Club, i, 359. 
Locality. Cor. Crag, Sutton. 
The shell figured in ‘Crag Moll.’ as variety 4 of O. plicata, Mont. seems to me now 
more to resemble the above shell conspicua ; that species and conoidea being the only two 
recent British species which, like our Crag shells, are denticulated on the inner side of the 
outer lip. I have assigned it to conspicua with doubt, as it may not improbably be some 
foreign species unknown to me. 
