History of British animals - University of Guam Marine Laboratory

Achatina. MOLLUSCA. PULMONIFERA. 267Gen. XX. ACHATINA. — Aperture of the shell longerthan broad ;the lipat the pillar truncated.85. A. acicula— Shell slender, tapering,the last whorl nearlyas long as all the preceding ones.Buccinum acicula, Mill. Verm. ii. 150.— B. turritum quinque anfractibusapertura ovali, Walk. Test. Min. t. 11. f. 60—B. terrestre, Mont.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 ;separatingline distinct ; mouth, with the outer lip thin, nearly even, ending at thepillar in a short gutter ; inner-lip at the extremity of the pillar subrecurved.The Achatina octona ; the Buccinum tenue album octo minimum orbium oList. Conch, t. xx. f. 15. ; the Helix octona of Dr Maton and Mr Rackett,Linn. Trans, vol. viii. t. v. f. 10., has been hastily considered as referred tobv Dr Pultney, under the title of Helix octona, Dorset, Cat. p. 49. This isan extra European species, and the shell of Dr Pultney is probably only theLymnea octona.Gen. XXI. SUCCINEA.— Shell with a short pointed spire;mouth longer than broad.86. S. putris.— Shell oblong, of three whorls, with a yellowishtinge.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, Mont. Test. Brit. 376.t. xvi. f. 4.— Among subaquatic plants, common.Length about fths of an inch, of a yellow or green tinge, finely striated bythe layers of growth. Body-whorl very large, the other small, pointed ; aperturevery wide in front, thin. Animal cinereous; the longest tentaculacontracted in the fore part. A variety of the shell sometimes occurs with athickened, expanded subreflected white lip.-Gen. XXII. V1TRINA. — Shell with a depressed spire;mouth transverse.87. V. pellucida.— Whorls three, glossy, transparent.Helix pellucida, Mull. Verm. ii. 15—Vitrina pellucida, Drop. 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.2Breadth nearly T 3 ths ;month rounded, the lip thin, slightlyreflected atthe small pillar cavity. The margin of the shield of the animal is double ;the upper fold divided into several lobes, which are capableof being reflectedover the shell. In 1809, I sent this shell from Zetland, to the late Mr Montagu,who considered it as the fry of the Helix nitida.