HELIX. 



181 



of foot inky, posterior extremity dirty flesh-color ; foot ratlicr 

 sleuder, terminating acutely ; respiratory foramen surrounded 

 with a blackish circle ; length about twice the breadth of the shell. 



Helix hortensis, Ml'ller. — Shell imperforate, siibglobose ; epi- 

 dermis shining, smooth, olivaceous-bellow, and often variously orna- 

 mented with rufous horizontal bands 



or lines ; whirls five, convex ; spire Fig. 317. 



somewhat elevated ; suture, at the 

 extremity of the last whirl, curved 

 towards the aperture ; peristome 

 slightly reflected, white, obsolete 

 on the base, with the margin thick- 

 ened internally; aperture rounded. Helix hortensis. 

 slightly contracted at the base by 



the thickening and indentation of the peristome ; umbilicus covered, in- 

 dented ; base convex. Greater diam. 20, lesser 17 ; height 12 mill. 



Helix hortensis, MtJLLER, &c. — Pfeiffek, Mon. Hel. Viv. Ill, 195. — Mrs. 



Sheppard, Tr. Lit. Hist. Soc. Quebec, 1, 193 (1&29).— Gould, Invert. 



172.— BixNEY, Terr. Moll. II, 111, pi. viii.— W. G. Binxey, Terr. 



Moll. IV, 51.— MoBSE, Amer. Nat. I, 186, f. 16 (1P67). 

 Helix subglohosa, Binney (formerly), Bost. Journ. Nat. Hist. I, 485, pi. 



xvi (1837).— DeKay, N. Y. Moll. 33, pi. ii, f. 14 ; pi. iii, f. 39. 

 Tachea hortensis, Morse, Journ. Portl. Soc. I, 10, f. 11, pi. iv, f. 12 



(1864).— Tryon, Am. Journ. Conch. II, 321, pi. vi, f. 14, 15 (1866). 



An European species, introduced by commerce (?) to the north- 

 eastern portion of North America. It is found on islands along 

 the coast from Newfoundland to Cape Cod, and on the main-land 

 plentifully in Gaspe, C. E. ; also along the St. Lawrence ; Yer- 

 mont (?), Connecticut (?), &c. 

 It also inhabits Greenland. 



Jaw arcuate, of uniform 

 width throughout ; ends blunt ; 

 centre of anterior surface, with 

 a few stout, distant ribs, den- 

 ticulating both margins. Com- 

 pare the fac-siniile of Moquin- 

 Tandon's figure of the jaw of a French specimen. 



Lingual membrane with 116 rows of 32 — 1 — 32 teeth each; 

 centrals long, obtusely conical ; first laterals of same shape. 



Fig. 318. 



Fig. 319. 



Jaw of Helix hortensis. 

 [Morse.] 



Jaw of 

 Helix hortensis. 



[MOQUIN- 



Ta.nuon.] 



