Achatina. MOLLUSCA. PULMONIFERA. 
267 
Gen. XX. ACHATINA. — Aperture of the shell longer 
than broad ; the lip at the pillar truncated. 
85. A. acicula — Shell slender, tapering, the last whorl near- 
ly as long as all the preceding ones. 
Buccinum acicula, Mill. Verm. ii. 150. — B. turritum quinque anfracti- 
bus apertura ovali, Walk. Test. Min. t. 1 1. f. 60. — B. terrestre, Mmit. 
Test. Brit. 248. t. viii. f. 3. — At the roots of grass and moss, England. 
Length ^th of an inch ; whorls six, white, glossy, rather flat ; separating 
line distinct ; mouth, with the outer lip thin, nearly even, ending at the 
pillar in a short gutter ; inner-lip at the extremity of the pillar subrecurved. 
The Achatina octona ; the Buccinum tenue album veto minimum orhium o 
List. Conch, t. xx. f. 15. ; the Helix octona of Dr Maton and Mr Ilackett, 
Linn. Trans, vol. viii. t. v. f. 10-, has been hastily considered as referred to 
by Dr Pultney, under the title of Helix octona., Dorset, Cat. p. 49. This is 
an extra European species, and the shell of Dr Pultney is probably only the 
Lymnea octonuu 
Gen. XXI. SUCCINEA. — ^Shell with a short pointed spire ; 
mouth longer than broad. 
86. putr is. — Shell oblong, of three whorls, with a yellow- 
ish tinge. 
Buccinum subflavum pellucidum trium spiraruin, List. An. Ang. 141. 
t- ii f. 24. ; Conch, t. 123. f. 23. — Helix putris, Linn. Syst. i. 1249. 
— H. succinea, Mull. Verm. ii. 97- — H. putris, Mmt. Test. Brit 376. 
t. xvi. f. 4. — Among subaquatic plants, common. 
Length about f ths of an inch, of a yellow or green tinge, finely striated by 
the layers of growth. Body-whorl very large, the other small, pointed ; aper- 
ture very wide in front, thin. Animal cinereous ; the longest tentacula 
contracted in the fore part. A variety of the shell sometimes occurs with a 
thickened, expanded subreflected white lip. 
Ger. XXII. VITRINA. — Shell with a depressed spire; 
mouth transverse. 
87. V. pellucida . — Whorls three, glossy, transparent. 
Helix pellucida. Mull. Verm. ii. 15 — Vitrina pellucida, Drap. Moll. 119. 
— Hel. elliptica, Brown., Wern. Mem. ii. 525. t. xxiv. f. 8 — Vit. pell. 
Flem. Phil. Zool. ii. 459. t. iv. f. 1.— Common among moss and grass. 
Breadth nearly y^ths ; mouth rounded, the lip thin, slightly reflected at 
the small pillar cavity. The margin of the shield of the animal is double ; 
the upper fold divided into several lobes, which are capable of being reflected 
over the shell. In 1809, I sent this shell from Zetland, to tlie late Mr Mon- 
tagu, who considered it as the fry of the Helix nitida. 
