HELTX. 



127 



Helix appi'essa. 



entering, erect, curved, tongue-shaped tooth, the basal Fig. 211. 



margin with a lamellar-like, long denticle, the right 

 margin sometimes with an erect tooth-like callus. 

 Greater diam. 18, lesser 15 ; height 8 mill. 



Helix appressa, Say, Journ. Phila. Acad. II, 151 



(1821) ; ed. Binney, 15. — Binney, Best. Journ. 



Nat. Hist. Ill, 356, pi. viii (1840) ; Terr. Moll. 



II, 140, pi. xiii.— DeKay, N. Y. Moll. 27, pi. ii, 



f. 11 (1843).— Pfeiffer, Mon. Hel. Viv. I, 317 ; in Chemnitz, Conch. 



2d ed. I, 361, t. Ixiii, f. 17, IS.— Reeve, Con. Icon. no. 689.— De- 



SHAYES in Fee. Hist. I, 141.— W. G. Bisnet, Terr. Moll. IV, 59.— 



Bland, Ann. N. Y. Lye. VII, 432. 

 Helix linguifera, Lamarck, An. s. Vert. VI, 90 (1822).— Ferpssac, Prodr. 



95 ; Hist. pi. xlix, a, f. 3.— Deshayes, Encycl. Meth. II, 224 (1830) ; 



in Lam. VIII, 70 ; ed. 3, III, 293.— Pfeiffer, Symb. ad Hist. Hel. 



19 (no descr.).— Chenu, 111. Conch, pi. xii, f. 5; pi. vii, f. 6. — 



Delessert, Recueil, pi. xxvi, f. 5 (1841). 

 Xolotrema appressa, Tryon, Am. Journ. Conch. Ill, 50, pi. ix,f. 7,11 (1867). 



In Pennsylvania and New York it is not found east of the 

 Appalachian chain. From thence it 

 ranges to Arkansas ; and from Georgia 

 to Illinois. 



Fig. 212 represents a smaller, more 

 angular form. Fig. 213 represents the 

 var. a of Say, which has two well de- 

 veloped teeth on the peristome. I have received it 

 from Virginia, Tennessee, Kentucky, Ohio, Indiana, 

 and Illinois. 



The jaw is very strongly arcuate, of uniform Avidth 

 throughout; anterior surface with ribs, denticulating 

 both margins. 



Lingual membrane with 105 rows of 40 — 1 — 40 

 teeth each ; central long, conical, surmounted with 

 a pointed apex ; laterals of same shape, but with an obtuse small 

 side tubercle ; uncini with long, irregular denticles. 



Fig. 215. 



Fig. 212. 



¥i£^. 213. 



Fig. 214. 



Jaw of Helix 

 appressa. 



Liugual dentition of Helix appressa. 



