132 PNEUMONOBRANCHIATA. 



21. 3. HELIX hybrida. The Brown-mouthed Snail. 



Shell somewhat globular, smooth, polished, 

 brown or yellow, brown-banded, with the rib of 

 the lip pale brown, and the edge whitish. 

 Helix hybrida. Pioret ; " Leach MSS." 



horterisis Var. Ferussac, Tabl. 31.; Alder, 



Mag. Z. 8f B. ii. 106. 



Inhab. woods and hedges with the former. 



The animal of this species differs from either Helix 

 hortensis or H. nemoralis, in the form of the vesicida 

 multifida, as well as in the colour of the mouth of 

 the shell. In all its characters it is intermediate be- 

 tween these two species, but yet I do not think there is 

 any reason to believe that it is a mule, or that it 

 unites them into one species. This species does not seem 

 to be so variable in its colour as either of its allies. 



Mr. Alder notices this species in his catalogue of 

 Newcastle shells. " A curious pale brown variety of 

 this species (H. hortensis) occurs at Stella, the lips 

 being of a paler shade of the same colour, and rarely 

 white." 



M. Deshayes believes this animal to be the mule 

 of the two species, as the name indicates; he says 

 they are not sterile (Lam. H. ed. 2. vi. 53.) He had 

 not observed the peculiarity in the vesicula multifida. 



22. 4. HELIX memoralis. Girdled Snail, (t. 1. f. 23.) 



Shell somewhat globular, smooth, yellowish or 

 brown, and mostly 5-banded, with the mouth 

 roundish lunate, compressed ; margin of the aper- 

 ture brown. 



Helix nemoralis. Linn. S. N. i. ; Montagu, p. 

 411.; Drap. p. 94. t. 6. f. 35.; Brard, p. 12. 



