HELIX. 175 



A. Shell globosely conic : outer lip sometimes thickened : 

 umbilicus small or indistinct. 



1. HELIX LAMELLA'TA*, Jeffreys. 



H. lamellata, Jeffr. in Linn. Trans, xvi. p. 333 ; F. & H. iv. p. 73, 

 pi. cxvii. f. 8, 9. 



BODY whitish ; back and head bluish-grey (A. Mil Her). 



SHELL pyramidal, thin, of a silky appearance and lustre, 

 yellowish-horncolour or tawny, closely and regularly striate 

 or plaited in the line of growth, with similar but much finer 

 striae in the interstices : epidermis rather thick : whorls 6, 

 cylindrical and compact, increasing gradually in size : spire 

 rather compressed and blunt : suture deep : mouth semi- 

 lunar : outer lip thin, slightly reflected on the pillar : um- 

 bilicus narrow, but very deep. L. O08. B. 0-09. 



HABITAT : Among dead leaves (especially those of the 

 holly) in woods in the northern counties of England, 

 Anglesea, the North and West of Scotland, and through- 

 out the greater part of Ireland. It also occurs as a fossil in 

 our upper tertiary beds at Copford. Dr. A. Miiller has 

 found it near Kiel and on the Isle of Rugen in Holstein, 

 and Lilljeborg afterwards discovered it in Sweden ; but 

 it does not appear to have been noticed elsewhere on 

 the Continent. 



The plaits on the surface of the shell are membranous 

 and form part of the epidermis. Further particulars of 

 the animal are desirable. I unfortunately neglected the 

 opportunity of making a note of it. 



This species is the H. Scarburgensis of Alder (from 

 Bean's MS.) and the H. seminulum of Rossmassler. 



* Covered with small plates. 



