u 



LAND AND FRESH- WATER SHELLS OF N. A. [PART I. 



Encycl. Meth. II, 219 (1830) ; in Lamarck, VIII, 66 ; ed. 3, III, 292. 



— Chenu, 111. pi. vi, f. 11. 

 Helix infecta, Pakreyss MS., Pfeiffer, Mai. Bl. 1S57, 86 ; Mon, Hel. Viv. 



IV, 91, non Reeve. 

 Helix slroniji/iodes, Pfeiffer, Proc. Zool. Soc. 1854, 53 ; Mon. Hel. Viv. 



IV, 91.— Reeve, Con. Icon. no. 1296 (1854).— T7(/e W. G. Binxey, 



Terr. Moll. IV, pi. Ixxvii, f. 8. 

 Helix mordax, Shuttleworth, Bern. Mitt. 1853, 195. — Gould in Terr. 



Moll. Ill, 19.— W. G. Binney, Terr. Moll. IV, 99.— Pfeiffer, Mon. 



Hel. Viv. Ill, 635. — Bland, Ann. N. Y. Lye. VII (and ya.T.ferf;nsoni). 

 Helix dubia, Sheppard, Tr. Lit. Hist. Soc. Quebec, I, 194. — McCulloch 



(where?), teste Binsey, Terr. Moll. I, 192. 



'Found over the whole of eastern North America as far n.orth 

 as Labrador. It is commonly found in the postpleiocene of the 

 Mississippi Yalley, retaining some of the color of the red flame- 

 like patches. 



Animal : head and eye-peduncles light slate-color, back brown, 

 remainder of upper surface brownish-orange, eyes black, base of 

 foot grayish-white, collar saffron. Eye-peduncles one-third of an 

 inch long, blackish at the extremities. Foot not much exceeding 

 in length the diameter of the shell, and terminating in a broad, 

 obtuse, and flat extremity. A light marginal line runs along the 

 edge of the foot from the head to the posterior part, those of the 

 two sides meeting in an acute angle. 



Yariety : Head and neck blackish-brown, eye-peduncles black- 

 ish, foot brownish, base dirty white. In a single instance the 

 whole animal was entirely black. 



The variation of color ranges from pale straw 

 to dark reddish-brown, in each extreme being 

 sometimes uniform. In outline the 

 variation ranges from depressed to 

 very globose. In sculpturing it 

 varies greatly. A comparatively 

 smooth variety, with a shining, 

 somewhat translucent epidermis 

 has been noticed in Xew York, by 

 Mr. Bland, under the name of var. 

 fergiisoni. A form with stronger 

 striae and well-developed carina is 

 figured in Fig. 123. The coarsely 

 striated form, which I presume to 

 be H. mordax, is figured also (Fig. 



Fig. 123. 



Fig. 124. 



Eelix altfrnata, 

 carinated. 



JJeUx aUcmntn, 

 var. mordua;? 



