COLIMACEA. 53 



pusilla, Jeffreys says, that the back being more sunk in some 

 species than in others, — which characterises the growth of 

 toothed land shells, — is sufficient proof that it is not the young 

 of V. pusilla. 



Genus XX.— AZECA Leach. 



Shell subcylindrical, somewhat obtuse ; covered with a pel- 

 lucid, glossy epidermis; aperture pyriform, obhque, curved, and 

 contracted, and terminating in a point above; peritreme thick, 

 obtuse, united all round, and toothed internally ; columella im- 

 perforated. 



1. AzECA TRIDENS, pi. V, f. 18. 



Azeca Matoni, Leach, Moll., p. 1 22, pi. 8, f. 8 ; Turton, 

 Man., p. 68, f. 52; Pupa Goodalli, Ferussac, Prod., p. 71 ; 

 Alder, Cat., p. 32; lb., Mag. Zool. and Bot., II, p. 110; Aseca 

 Britannica, Kenyon, Mag. Nat. Hist., II, p. 426, f. n ; Turho 

 tridens, Montagu, Test. Brit., p. 338, pi. 11, f . 2 ; Maton and 

 Rackett, Linn. Tr., VIII, p. 181; Turton's Linne, IV, p. 499; 

 lb., Brit. Fau., p. 184; Brown, Ency. Brit., 6th Ed., VI, p. 

 456 ; Pupa tridens, Lamarck, An. San. Vert., VI, pt. 2nd, p. 

 108; Helix tridens, Muller, Verm., II, p. 106, No. 305 ; Azeca 

 tridens, Brown, lUust. Conch., p. 42, pi. 14, f. 2; lb.. First Ed., 

 pi. 41, f. 2. 



Shell subcylindrical, subpellucid, glabrous, glossy, and of a 

 horn-colour ; body not quite so long as the spire, which consists 

 of five or six slightly inflated volutions, terminating in a some- 

 what obtuse apex, with some minute longitudinal strise near the 

 suture; aperture pyriform, oblique, a little curved; columella 

 slightly reflexed, with two long and two short teeth alternating; 

 outer lip with a single tooth on its margin. Length a quarter 

 of an inch. 



Inhabits close, shaded, woody situations, among moss, under 

 stones, and among decayed leaves, &c. 



Genus XXI. — HELIX Linnaeus. 



Shell orbicular, or subglobose, thin ; body very large ; spire 

 short, and small in proportion to the body; aperture oblique; 

 outer lip reflected, and interrupted by the bulging of the body; 



