120 



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



Fig. 198. 



linear, almost closed by a broad, jaw-shaped denticle within the peristome ; 

 peristome thickened, its terminations joined by a stout, erect 

 parietal callus, the right margin subrectilinear, arched, angu- 

 larly merging into the very heavy basal margin ; within the 

 base of the shell is a transverse tubercle. Greater diam. 7, 

 lesser 6 ; height 5 mill. 



Helix maxiUata, Gopld, Proc. Bost. Soc. Ill, 38 ; in Terr. 



Moll. II, 157, pi. xl, a, f. 2.— Pfkiffer, Mon. Hel. Viv. 



Ill, 126 ; IV, 164.— W. G. Binxey, Terr. Moll. IV, 65. 



Stenotrema maxillata, Tryon, Am. Journ. Conch. Ill, 57, pi. ix, f. 31, 35 



(1867). 



Tennessee, Alabama, Georgia. 



Fig. 199. 



Helix germana., Gould. — Shell imperforate, solid, depressed, low- 

 conical above, convex beneath, slightly angular at periphery, covered with 

 a scabrous, rusty horn-colored epidermis, beset with scattered hairs ; wliirls 

 five and a half, closely revolving, separated by a well impressed 

 suture ; aperture lunate, the basal portion being but slightly 

 curved, and turning upward at a rather sharp angle ; peristome 

 incumbent, with a deep stricture behind it, moderately reflexed, 

 roseate ; on the parietal wall of the aperture is a distinct, oblong, 

 erect, white tooth, not connected with either extremity of the 

 peristome. Greater diam. 7.J, height 5 mill. 

 Helix germaim, Gould, U. S. Expl. Exped. Moll. (1852), 70, f. 40, a, b, c ; 

 Terr. Moll. II, 156, pi. xl, a, f. 3.— Pfeiffek, Mon. Hel. Viv. Ill, 

 269.— W. G. BixNEY, Terr. Moll. U. S, IV, 11. 

 Stenotrema germana, Tryon, Am. Journ. Conch. Ill, 58, pi. ix, f. 22, 23 

 (1867). 



Oreffon. 



Fig. 200. Fig. 201. Fig. 202. 



Helix monodon, Rackett. — Shell imperforate or umbilicated, 



globose-depressed, diaphanous, reddish 

 horn-colored, covered with short hairs ; 

 spire rather convex ; whirls five and a 

 half, the upper ones flattened, the two 

 last convex, the last anteriorly gibbous, 

 constricted at the aperture ; umbilicus 

 more or less opened, or completely closed ; 



' The specimen figured is abnormal in not having a parietal tooth. 



