59 



43. Helix pura. Shell flattish, glossy, of a pale 

 horny crystallme transparency, with four and a 

 half volutions which suddenly enlarge : aperture 

 oblique : umbilicus rather large. 



Shell larger than the last, more convex and more 

 distinctly striolate, not so transparently hyaline ; 

 and may be easily distinguished, 1. by the number 

 of its volutions ; 2. by the deeper and more oblique 

 crescent of its aperture ; and 3. by its much larger 

 umbilicus. 



\ perfect series of this very distinct species was sent 

 us by our friend Mr. Alder of Newcastle, who first 

 distinguished it. We also find it, not unfrequently, 

 among fallen leaves and in ditches. It had doubt- 



o 



less been passed by as the young of some other 

 species. 



44. Helix radiata. Shell flattish, slightly carinate, 

 deeply striate rufous-grey with chestnut rays. 



b. quite flattened at top. 



Helix rotundata. Turt. Diet. p. 53. 



c. White, transparent, and without rays. 



Helix radiata. Montagu, p. 431. t. 24!. f. 3. 

 ^ Da Costa, p, 57. t. 4./. 15, 16. 



