270 



ON HELICELLA (CANDIDULA) CRAYFOBDENSIS, n.sp., FKOM 

 TEE PLEISTOCENE DEPOSITS OF SOUTH-EASTEEN ENGLAND. 



By A. S. Kennaed, F.G.S., and B. B. Woodtvakd, F.L.S. 



Read 13th March, 1915. 



The form we here describe has long been known from the 

 Pleistocene deposits of South-Eastern England, as well as Northern 

 France, but has always been assigned in faunal lists to Helicella 

 caperafa (Mont.).' 



This determination had for a long time appeared to us unsatisfactory, 

 and when better preserved forms were discovered at Woodston we 

 were disposed to agree with the Kev. C. E. Y. Kendall- that the shell 

 was more properly referable to II. candidula (Studer), and under that 

 name we included it in our List of British Non-Marine Mollusca, 

 1914 (p. 6). 



Further study has, however, convinced us that Mr. J. W. Jackson ^ 

 is right, and that the form in question is in fact a new species. We 

 therefore now describe it as such, taking the specific name from the 

 British locality at which it was first and principally found. 



Helicella (Candidula) ckatfordensis, n.sp. 

 Testa umbilicata, globoso-depressa, confertim irregulariter costulato- 

 striata, sed apice nitida, fasciis spiralibus oruata, vel albida ; spira 

 convexa, depresso-conoidea, anfractus 4J, convexi, lente accrescentes, 



ultiraus antice vix deflexus, ad peripheriam subrotundus, vix 

 carinatus; apertura diagonalis, quadrato-lunaris ; peristoma acutum, 



1 Prestwich, Phil. Trans., el, 1860, p. 286 ; Dawkins, Quart. Journ. Geol. Soc, 



xxiii, 1867, p. 100; Cheadle & Woodward, Proc. West London Sci. 



Assoc, i, 1876, p. 98; Woodward, Proc. Geol. Assoc, xi, 1890, table; 



Kennard & Woodward, op. cit., xvii, 1901, table. 

 - Jom-n. Conch., xiv, 1913, p. 88. 

 ^ "Notes on the Candidula section of Helicella" : Journ. Conch., xiv, 



1914, p. 199. 



