PROCEEDINGS OF SOCIETIES. 83 



590 Limax bmnneus, Draparnaud ? v. 4. p. 20. 



591 Limax tenellus, Muller. v. 4. p. 21. 

 f592 Limax Sowerbii, Ferussac. v. 4. p. 22. 



f 593 Limax gagates, Draparnaud. v. 4. p. 24. 



III. TESTACELLIDJE. 



j-594 Testacella haliotoidea, Draparnaud. v. 4. p, 26. 

 IV. HELICID^E. 



595 Vitrina pellucida, Muller. v. 4. p. 30. 



596 Zonites cellarius, Muller. v. 4. p. 33. 



597 Zonites alliarius, Muller. v. 4. p. 34. 



598 Zonites nitidulus, Draparnaud. v. 4. p. 36. 



599 Zonites purus, Alder, v. 4. p. 37. 



600 Zonites radiatulus, Alder, v. 4. p. 38. 



601 Zonites nitidus, Muller. v. 4. p. 39. (Z. lucidus of Gray's Turton.) 



602 Zonites excavatus, Bean. v. 4. p. 40. 



603 Zonites crystallinus, Muller. v. 4. p. 41. 



604 Helix aperta, Born. v. 4. p. 43. 

 f605 Helix aspersa, Muller. v. 4. p. 44. 



606 Helix pomatia, Linneus. v. 4. p. 46. 

 f607 Helix arbustorum, Linneus. v. 4. p. 48. 



608 Helix cantiana, Montagu, v. 4. p. 50. 



609 Helix carthusiana, Muller. v. 4. p. 51. 

 f610 Helix nemoralis, Linneus. v. 4. p. 53. 



f611 Helix hortensis, Draparnaud. From comparison of some hundreds 

 of this Mollusc, and the one immediately preceding in a living 

 state, and of all ages we are led to consider them as totally different 

 species. It is stated in Messrs. Forbes and Hanley's " British Mollusca," 

 " that complete series may be obtained, beginning with the typical 

 * nemoralis' to 'hybrida,' and ending in 'hortensis.'" Although some 

 five or six hundred specimens have been examined by us, we have never 

 yet found such a series ; but have been, in all cases, able to distinguish 

 between both shells. We regard the Helix hybrida as a variety of 

 H. hortensis, and have specimens of every shade of gradation between 

 the two. Without entering fully into particulars in this place, we may 

 add, that in all cases where we were shown a series of shells between 

 H. nemoralis and hortensis, some of the specimens, and those the most 

 important in the chain, were invariably either drift shells or had been 

 scorched during the process of burning the furze (Ulex Europeeus), a 

 practice common throughout Ireland. 



f612 Helix Pisana, Muller. v. 4. p. 56. 



j-613 Helix virgata, Da Costa, v. 4. p. 57. 

 614 Helix caperata, Montagu, v. 4. p. 59. 



f 615 Helix ericetorum, Muller. v. 4. p. 61. 



616 Helix obvoluta, Muller. v. 4. p. 63. 



617 Helix lapicida, Linneus, v. 4. p. 65. 

 |618 Helix rufescens, Pennant, v. 4. p. 66. 



|619 Helix hispida, Linneus. v. 4. p. 68. (Includes as varieties H. sericea, 

 H. concinna, and H. depilata of Gray's Turton.} 



620 Helix revelata, Ferussac. v. 4. p. 70. 



621 Helix Sericea, Draparnaud. v. 4. p. 71. (H. granulataof Gray's Turton.} 

 |622 Helix lamellata, Jeffreys, v. 4. p. 73. 



623 Helix aculeata, Muller. v. 4. p. 74. 



624 Helix fulva, Muller. v. 4. p. 75. 



625 Helix fusca, Montagu, v. 4. p. 77. 



-626 Helix pulchella, Muller. v. 4. p. 78. 



627 Helix rotundata, Muller t v. 4. p. 80. (Zonites rotundatus of Gray's 



Turton.} 



