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 resembled that of an older Tertiary bed. It was 

 evidently a derived specimen. 



Cyclostuema l^vis, Philippi. Supplement, Tab. V, fig. 13, a, b. 



Delphinula l^evis, Phil. En. Moll. Sic, vol. ii, p. 1-16, pi. xxv, fig. 2, 1844. 



Diameter, one line, nearly. 



Locality. Coralline Crag, Sutton. 



I have two specimens which correspond so closely with the figure and description of 

 the Mediterranean shell above referred to that I have 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. The fine striations which cover the 

 under side of serpuloides do not appear in my shell, but they may possibly have become 

 obliterated. 



Cyclostuema ? sph;eroidea, S. Wood. Crag Moll., vol. i, 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 Marry at, of which Helix serpuloides 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. 



Homalogrya atomus, Phil. Supplement, Tab. VII, fig. 28. 



Skf.nea nitidissima, Forb. and Han. Vol. iii, p. 158, pi. lxxiii, f. 7, 8. 

 Homalogyba atomus, Jeff. 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 

 Caecum, but it differs from that shell in having an upper and under side, whereas in 

 Cacum the whorls are perfectly horizontal. I have referred my present specimen to a 



