THE NATURAL HISTORY SURVEY. 215 
bicuspid lateral teeth, all longer than wide. ‘Genital system 
lacking all accessory appendages.” (Pilsbry.) 
Distribution: ‘“Holarctic realm.” (Pilsbry.) 
83. Punctum pygmzum Drap., pl. xxviii, fig. 20. 
flelix pygm@um DRAP., Tab. Moll. p. 114, pl. viii, figs. 8-10, 1801. 
Flelix minutissima LEA, Trans. Amer. Phil. Soo., Vol. 1X, p. 17; Proc., 
Vol. II, p. 82, 1841. 
Shell: Subglobose, rather strong, umbilicated; surface 
dull or shining, marked by numerous strong, rounded, ele- 
vated striz and very fine spiral lines, which are stronger on the 
base than elsewhere; color reddish or brownish; periphery 
rounded; sutures very deeply impressed, especially between 
the last. two whorls; whorls four, convex, regularly and gradu- 
ally increasing in size; spire elevated, convex; aperture some- 
_ what oblique, crescentic, ample; peristome simple, rather solid; 
columella subreflected, the terminations of the aperture widely 
separated; umbilicus wide, deep, showing all the velutions to 
the apex. 
Greater diameter, 1.00; height, 0.50 mill. (11457.) 
Animal: Not observed. 
Genitalia: Not observed. 
Faw: ‘“Arcuate or horse-shoe shaped, composed of thir- 
teen to nineteen separate rhomboidal plates, more or less 
Fig. 52. 
Jaw of PuncTuM PYGM#uM Drap. (After Binney.) 
overlapping, the outer imbricating over the inner plates; the 
median two or three plates slightly separated, not overlap- 
ping.” (Pilsbry.)* (Fig. 52.) 
Radula formula: 13+4-+13 (13—1—13); central tooth with 
a long and narrow base of attachment, the lower outer corners 
somewhat expanded, but the lower edge straight or only 
slightly concave; reflection tricuspid, the central cusp short, 
wide, rather sharp, reaching about a third of the distance from 
upper to lower edge of basal plate, side cusps very short and 
wide, rounded; lateral teeth with a base of attachment almost 
as wide as long, squarely truncated at the lower edge; reflec- 
*Guide to Study of Helices, p. 7. 
