80 SUPPLEMENT TO THE CRAG MOLLUSCA. 
Tab. VII, fig. 10, called Z. striatua, which, however, I think is also different from the 
Crag shell. Lacuna cliona, Raincourt and Munier, ‘Journ. de Conch.,’ vol. xi, p- 201, 
Pl. VII, fig. 1, is a similar Eocene fossil with a reticulated surface ; this group might, I 
think, be separated from Zacuna, the only resemblance to which is the elongated 
umbilicus. Fig. 23 of Supplement Tab. V was engraved under an impression I had 
that it might be Lacuna quadrifasciata. It, however, differs so little from some of the 
least elongated forms of Littorina suboperta, that it may be an immature form of that 
shell. 
Lacuna viycra, Mont. Crag Moll., Appendix, p. 316, Tab. XXXE fig. 13. 
Localities. Fluvio-marine Crag, Bramerton. Post Glacial, March, and Kelsea Hill. 
This shell seems to be confined-to the Fluvio-marine Crag (where, according to Mr. 
Reeve, it is rare) and not to have occurred in any other Crag, or East Anglian Glacial bed. 
It is abundant and in good preservation in the March Gravel, and is given by Mr: 
Jeffreys as abundant at Kelsea Hill. 
Lacuna crassior, Mont. ? 
This shell is given as occurring at Kelsea Hill, by Mr. Jeffreys, in ‘ Quart. Jour. 
Geol. Soc.,’ vol. xvii, p. 450, but he is silent as to it in his ‘Brit. Conch.’ I insert ats 
therefore, with doubt as an East Anglian fossil. 
TRocHus TuRGIDULUS ? Brocchi. Supplement, Tab. V, fig. 8. 
TRocHUs TURGIDULUS, Broce. Conch. foss. Subap., vol. ii, p. 353, t. v, fig. 16, 1814. 
Alt. + of an inch. 
Locality. Coralline Crag, Sutton. 
‘'wo small specimens found by myself are here referred with doubt to the above- 
named species ; they differ from T’. J/ontacuti in having a sharper angle to the lower part 
of the volution, and they have been somewhat abraded, by which a great part of the 
outer coating has been removed, obliterating some of its character. ‘They are smaller than 
the representation by Brocchi, but they may not be full grown ; they resemble the figure 
by Dubois, ‘Coq. Foss. Volh. Pod.,’ Pl. II, figs. 29, 30, but are less strongly striated. 
It is, however, an unsatisfactory identification. 
