Mollusca of Great Britain. 341 



Helix nitens. Maton ^ Rackett in Linn. Trans. 8. p. 198. 

 t.5.f.7. ^,. 'fv'. 



cellaria. Lam. Hist, des Anim. sans Vert. 6. p. 91. 



Common ; found with the last. 



23. Alliacea. 



Animal nigrescens. Tentacula brevia, cylindrica. 



Testa supr^ plana, politissima, diaphana, rufescenti-cornea ; 



subtiis lactea. Anfractus 4 — 5, sutur^ marginat4. Aper- 



tura obliqua, subrotundo-lunata. Umbilicus suban- 



gustatus, sinu profundo. 



Long. 0.1.— Diam. 0.225. 



Helix alliaria. Miller in Ann. of Philos. 1822, p. 379. 



Under stones &c. in moist situations ; often in company 

 with the H. nitida, but by no means so common. The ani- 

 mal has a strong odour of garlic, which is very perceptible 

 on its being plunged into boiling water. It is a very distinct 

 species, and differs from the young of the last in the greater 

 depression of its spire, and greater transparency and con- 

 traction of the umbilicus. First described by Mr. J. S. Mil- 

 ler in the Annals of Philosophy for 1822. 



24. Crystallina. 



Animal lacteum. Tentacula superiora obtus^ cylindrica. 



Testa supr^ plana, vitrea, hyalina, politissima. Anfractus 5, 



pariim decrescentes, subtiis convexiusculi, suturi sub- 



marginata. Apertura lunata. Umbilicus angustatus, 



foramine cylindrico. 



Long. 0.075.— Diam. 0.125. 



Helix crystallina. Miill. Verm. 2. p. 23. Drap. Hist. 



des Moll. p.U8. t. 8./. 13—17. Non Billw. Cat. 2. 



p. 909. 



Under 



