86 SUPPLEMENT TO THE CRAG MOLLUSCA. 
to this genus which was obtained from the nodule workings in the Red Crag near 
Woodbridge, the matrix of which maven olen that of an older Tertiary bed. It was 
evidently a derived specimen. 
CYcLOSTREMA LAVIS, Philippi. Supplement, Tab. V, fig. 13, a, 6. 
DELPHINULA LavIs, Phil. En. Moll. Sic., vol. ii, p. 146, pl. xxv, fig. 2, 1844. 
Diameter, one line, nearly. 
Locality. Coralline Crag, Sutton. 
I have two specimens which correspond so closely with the figure ne description of 
the Mediterranean shell above referred to that Ihave adopted for them the name given by 
Philippi. I have compared my fossils with recent specimens of serpuloides, and I think 
the coarse and prominent ridges surrounding the umbilicus, of which there are no traces 
in serpuloides, is sufficient for specific distinction. ‘he fine striations which cover the 
under side of serpuloides do not appear in my shell, but they may possibly have become 
obliterated. 
CycLtostrEMA? spHm@roipEa, S. Wood. Crag Moll., vol. 1, p. 122, Tab, XV, fig. 9 (as 
Turbo). 
Locality. As in ‘ Crag Mollusca.’ 
This shell has, I find, beeen obtained by Mr. Jeffreys in the recent dredgings in the 
Bay of Tangiers, and in his‘ Report,’ 1870, p. 161, is referred by him to the genus 
Cyclostrema of Marryat, of which Helie serpulordes is supposed to be the type. I have here 
adopted that generic name, though not without misgivings, as the peretreme of my shell 
is not continuous. It does not seem far removed from Adeorbis subcarinatus. 
Homatoerya atomus, Phil. Supplement, Tab. VIL, fig. 28. 
SKENEA NITIDIssiMa, Ford. and Han. Vol. iii, p. 158, pl. Ixxni, f. 7, 8. 
HoMALOGYRA AtToMUS, Jef. Brit. Conch., vol. iv, p. 99. 
Locality. Cor. Crag, Sutton. 
This represents a very minute shell which I have lately found in the Cor. Crag of 
Sutton, and I am anxious to preserve its likeness on account of the dangers attending 
such a minim. It resembles the young state of Valvata cristata. My specimen is 
probably not full grown, as it has only two volutions. It is like the spiral portion of 
Cecum, but it differs from that shell in having an upper and under side, whereas in 
Cecum the whorls are perfectly horizontal. I have referred my present specimen to a 
