MARSHALL : ADDITIONS TO " BRITISH CONCHOLOGY." 203 



latter is described as having "curved and flexuous longitudinal ribs," 

 which are absent from the figure ; and while Jeffreys gives it 5-6 

 whorls, the figure shows 3-4. The length also should be i in., 

 instead of f in. In its general aspect the shell is not unlike some of 

 the forms of our common species Purpura lapillus. 



Figures of F. attenuatus Jeff.^ and F. consimilis INTarsh.^ well 

 exhibit the difference in the embryonic whorls of these two allied 

 species, although part of the bulbus apex of the latter has been 

 broken by an accident since I described it^ ; otherwise they are very 

 much alike. 



A fine living specimen of F. ebur Morch, from off the Butt of 

 Lewis in 26of , is in the collection of Mr. Tomlin, an excellent figure 

 of which well represents its facies.^ I had already recorded its 

 occurrence in the same district (ex Knight Errant), and it is one of 

 our Crag fossils. A specimen has also been dredged in the Atlantic 

 off Ireland, in 320-372^, by the Irish Fishery Board. 



This brings to a close my series of Papers under the aVjove title. 

 The references to Parts I. to VI. were given at the beginning of 

 Part VII.,^ while those to Part VII. are as follows : — 



Additions to " British Conchology," Part VII., Journ. of Conch., 

 vol. 13, 1911, nos. 6, 7, 8 ; 1912, nos. 10, ti ; vol. 14, 1913, nos. 

 2, 3, 4; 1914, nos. 6, 7; 1915, no. 11 \ vol. 15, 1916, nos. 2, 3, 

 19 1 7, nos. 6, 7. 



Helicella virgata (Da Costa) in Wirral, Cheshire. — In July last I obtained 

 about half-a-dozen dead specimens of Helicella virgata on sand-dunes bordering the 

 Birkenhead Road, Meols, Cheshire. I was unable to find living examples owing 

 to the dryness of the weather. The specimens were old, recently dead, as some 

 contained the dried-up animals. Mr. C. Oldham in his " Land and Freshwater 

 Mollusca of Cheshire " (^Naturalist, April, 1896, p. 118) cites an old record of this 

 species for Hilbre Island (T. S. Marratt, fide Gregson, " Naturalist's Scrap-Book," 

 p. 23), but says that he looked for the species in vain when at Hilbre in 1894. 

 The Meols discovery appears to be the first record for the mainland. — J. Wilfrid 

 Jackson {Read before the Society, Nov. 8th, 1916). 



[Note added July 6th, 1917. — In July this year I found many living immature 

 specimens of the above species in the Meols locality. I also discovered a number 

 of shells of the same species in blown sand on the coast between West Kirby and 

 Caldy, but no living examples were seen in this neighbourhood. — J.W.J.] 



1 Sykes : Moll. ' Porcupine' Exp., Proc. Malac. Soc, iQii, vol. ix., p. 337 (woodcut). 



2 Journ. of Conch., 1912, pl. Si fig- 4- 



3 Notes on British Fusus, &c., Journ. Malac, 1902, vol. ix., p. 49. 



4 Journ. of Conch., 1912, pl. 5, fig. 5. 



5 Journ. of Conch., 1911, vol. 13, p. 179. 



