204 TERRESTRIAL AIR-BREATIIING MOLLUSKS. 



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

 peduncles lon<^ and slender, tentacles very short. 



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



Lingual membrane (1*1. 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, oblic^ue, 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 Ffeiffer it would be placed in Bulimimis of Albers and Martens. 

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



Pupa modica, Gould. 

 Vol. III. PI. LII. Fig. 2. 



Shell small, delicate, elongated, ovate-conic, Avhitish 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 (lestitute of teeth. Length, 2^ mill. ; diameter, 1| mill. 



Fupa modica, Gould, Proc. Post. Soc. Nat. Hist., III. 40 (1848) ; Terr. Moll., 

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

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



Bulimu^ niodicus, Pfeiffer, Mon. Hel. Viv., IV. 414. 



PiLpilla modica, Tryon, Amer. 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 \ 



Pupa fallax, except that it is only about half as large, and has about two whorls 'A 



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



stome is thin and revolute instead of being thick and flattened. ! 



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, 

 FiGj 108. 



continuously slightly reflected, its ends approximating, joined by 



a light callus, that of the columella straight, dilated. Length, 4^, 



diameter, 2 mill.; aperture, 1^ long, 1 mill. wide. 



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

 PI. XXI. Fig. 6(1866). — W. G. Binney, L. & Fr.-W. Sh., I. 

 240, Fig. 416 (1869). 



Arizonensis. Leiicochila Arizonensis, Tryon, Amer. Journ. Conch., III. 305 ^: 



(1868). 



