204 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Head, neck, and eye-peduncles black, posterior and lower parts lighter; eye- 

 peduncles long and slender, tentacles very short. 



Jaw wide, low, slightly arcuate, ends blunt, but little attenuated. 



Lingual membrane (PL IV. Fig. T) as usual in the genus. Teeth about 

 15 1 15, with about 7 perfect laterals. Centrals quite narrow, the reflected 

 portion very small, tricuspid. Laterals quite broad, bicuspid. Marginals quad- 

 rate, low, wide, with one inner, long, oblique, blunt denticle, and several outer, 

 small, irregular, blunt denticles. The outer lower edges of the centrals and 

 laterals have the projecting or short reinforcements shown in the figures referred 

 to above. 



Though we retain the species in the genus Pupa, it must be remembered that 

 as treated by Pfeiffer it would be placed in Buliminus of Albers and Martens. 

 In general form of shell it certainly approaches Buliminus montanus, Drap. 



Pupa modica, GOULD. 

 Vol. III. PL LII. Fig. 2. 



Shell small, delicate, elongated, ovate-conic, whitish or pale horn-colored, im- 

 perforate ; whorls 5, 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, 2| mill. ; diameter, If mill. 



Papa modica, GOULD, Proc. Bost. Soc. Nat. Hist., III. 40 (1848) ; Terr. Moll., 

 II. 318, PI. LII. Fig. 2. W. G. BINNEY, Terr. Moll., IV. 142 ; L. & Fr.-W. 

 Sh., I. 240 (1869). PFEIFFER, Mon. Hel. Viv., III. 533. 



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



Pupilla modica, TRYON, Ainer. Journ. Conch., III. 306 (1868). 



Southern Region, in Georgia, Florida, and Alabama. 



The form and other characters of this shell are almost precisely those of 

 Pupafallax, except that it is only about half as large, and has about two whorls 

 less to the spire. The aperture is somewhat more bell-shaped ; and the peri- 

 stome is thin and revolute instead of beinjr thick and flattened. 



o 



Pupa Arizonensis, GABB. 



Shell rimate, oblong-fusiform, thin, delicately wrinkled, pellucid, horn-color ; 

 spire elongated, apex obtuse ; whorls 5, 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, 4j, 

 T diameter, 2 mill.; aperture, li long, 1 mill. wide. 



Pupa (Modicella) Arizonensis, GABB, Amer. Journ. Conch., II. 331, 

 PL XXI. Fig. 6(1866). W. G. BINJSEY, L. & Fr.-W. Sh., I. 

 240, Fig. 416 (1869). 



Arizonensis. Leucochila Arizonensis, TRYON, Amer. Journ. Conch., III. 305 

 (1868). 



