HELIX ASPERSA. 247 
At ten p.m. on the same day, five of the marked shells were absent, and two 
were traced to a small jungle of Cumpanula pyramidalis a short distance 
away ; the others were evidently still further atield and could not be found, 
but on the following morning six of the marked shells were present, showing 
that four of those absent in the early evening of the previous night had 
again returned to the same resting place, and all were affixed within the 
line drawn around the group when first found, except oue which was resting 
just outside the marked area. 
Fic. 321.—Feeding tracks of //elix asfersa, showing their general character, as seen upon the paste 
and whiting used in coating the glass 1 oof of the greenhouse of the Rev. Dr. Norman, at Berkhamstead, 
one-fourth natural Seago photograph supplied by the Rev. Dr. Norman). 
. 
Whether the absentee had fallen a victim to an early thrush or other 
enemy or had lost its way was uncertain and could nct be determined. 
The striking results of this experiment would probably have been still 
more remarkable if the evening examinaticns had Leen made at a later 
hour, as in all probability the whole of the snails went out foraging every 
favourable might. 
"pert sae 
= ———— we a 
—_ 
Fic. 322.—Feeding track of Helix asfersa, as shown upon the paste and whiting coating the glass of 
the greenhouse of the Rev. Dr. Norman at Berkhamstead, natural size (from photograph supplied by 
the Rev. Dr. Norman). 
Food.—'l'his species would appear to be fairly omnivorous, readily 
devouring many different kinds of food, and it is also probable that each 
species possesses some individuality in the track left by their browsing,’ 
1 Monog. i., p. 260, f. 520. 
