240 



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



Pupilla fallax, Mokse, Auier. Nat. 609, f. 53 (1868). 

 Paludina turrita, Meske ? Syn. Meth. 40. 



From Nebraska to Texas and From New England to South 

 Carolina. In several of the West India Islands. 



Pupa modica, GoniiO, — Shell small, delicate, elongated, ovate- 

 conic, whitish or pale horn-colored, imperforate ; whirls five, convex, the 

 apex of the spire acute ; aperture expanded, peristome revolute, 

 but not flattened, its right-margin strongly curved above ; throat 

 destitute of teeth. Length 2j, diam. 1| mill. 



Pupa modica, Godld, Proc. Bost. Soc. Nat. Hist. Ill, 40 (1848) ; 

 Terr. Moll. II, 318, pi. lii, f. 2.— W. G. Binney, Terr. Moll. 

 IV, 142.— Pfeiffer, Mon. Hel. Viv. Ill, 533. 

 Bulimus modicus, Pfeiffer, Mon. Hel. Viv. IV. 414. 



Georgia, Florida, and Alabama. 

 This species is very nearly allied, if not identical with 

 Pupa fallax. 



Fig. 416. 



Pupa arizonensis, Gabb. — Shell rimate, oblong-fusiform, thin, 

 delicately wrinkled, pellucid, horn-color; spire elongated, apex obtuse; 

 whirls five, convex, the last equalling one-half the shell's 

 length ; aperture oblique, oval ; peristome thickened, white, 

 continuously slightly reflected, its ends approximating, joined 

 by a light callus, that of the columella straight, dilated. 

 Length 4^, diam. 2 ; aperture Ij long, 1 mill. wide. 



Pupa (Modicella) arizonensis, Gabb, Am. Journ. Conch. II, 

 331, pi. xxi, f. 6 (1866). 



Arizona, at Fort Grant, junction of Arivapa and 

 San Pedro Rivers. 

 The description and figure are drawn from an authentic speci- 

 men. The species is less elongated, more blunt, and has more 

 convex whirls than Pupa fallax. 



