AcHATiNA. MOLLUSCA. I'ULMONIFEKA. 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.\erm.\L 150. — B. turritum quinque anfracti- 



bus aperlura ovali, Walk. Test. Min. t. 11. f. GO — B. terrestre, Mont. 



Test. Brit. 248. t. viiL 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 ternie album octo minimum orbium o 

 List. Conch, t. xx. f. 15. ; the Helix' octona of Dr Maton and Mr Raclcett, 

 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 octoruu 



Gen. XXI. SUCCINEA.— Shell with a short pointed spire ; 

 mouth longer than broad. 



86. S. putris. — Shell oblong, of three whorls, with a yellow- 

 ish tinge. 



Buccinum subflavum pellucidum trium spirarum, List. An. Ang. 141. 

 t. ii £ 24. ; Conch, t. 123. f. 23.— Helix putris, Linn. Syst. i. 1249. 

 — H. succinea, Mull. Verm. ii. 97 — H. putris, MonL 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. 



Gen. XXIL VITRINA. — Shell with a depressed spire; 

 mouth transverse. 



87. V. pellucida. — Whorls three, glossy, transparent. 



Helix pellucida. Mull. Verm. ii. 1 5 — Vitrina pellucida, Drap. Moll. 1 1 9. 

 — 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 /gths ; 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 ca^jable of being reflected 

 over the shell. In 1800, I sent this shell from Zetland, to the late Mr Mon- 

 tagu, who considered it as the fry of the Helix nitida. 



