GASTROPODA 



521 



Fig. 802 



Fig 803 



Fig. 802 — Helix hortcuKis (Binney). Fig. 803 — 

 Polygyra auriformis (Binney). 



P. auriformis (Bland) (Fig. 803). Shell white or yellowish, stri- 

 ated, with a very short spire, umbilicus open ; aperture ear-shaped, con- 

 tracted by 3 prominent teeth; height 6 mm.; diameter 11.5 mm.: Texas 

 to Georgia; very common. 



P. hirsuta (Say). Shell brownish and covered with rigid hairs; 

 aperture veiy narrow, being contracted by an elongated tooth on the 

 parietal wall ; umbilicus 

 closed; height 5 mm.; diame- 

 ter 9 mm. : New England to 

 Kansas, south to Virginia. 



P. monodon (Rackett). 

 Shell yellowish, umbilicus open 

 or closed, aperture lunate, 

 with an elongate tooth on the 



parietal wall ; peristome white, reflected ; height 6 mm. ; diameter 11 mm. : 

 eastern and central America; common, generally in groups of about a 

 dozen. 



P. profunda (Say) (Fig. 804). Shell depressed, with a wide umbili- 

 cus, and with numerous narrow revolving dark lines; color brownish 

 or j^ellow; height 15 mm.; diameter 30 mm.: central states J abundant. 

 P. tridentata (Say). Shell with low, depressed, yellowish spire, 

 with 5V2 whorls and open umbilicus; aperture with 3 teeth; 8 mm. high; 

 16 mm. in diameter: eastern North America. 



P. palliata (Say). Shell dark brown, 

 with 5 whorls; aperture with white peri^ 

 stome and 3 teeth; umbilicus closed; height 

 10 mm.; diameter 21 mm.: eastern North 

 America. 



P. inflecta (Say). Shell, brown in color, 

 striated, umbilicus closed; aperture con- 

 tracted with 2 acute teeth on the inner 

 margin of the peristome, and a long low 

 tooth on the parietal wall; height 6.6 

 southern ^nd central states west of the 



Fig. 804 



Fig. 805 



Fig. 804 — PoliKjyra profunda 

 (Baker). Fig. SOr. — FoUiyyra 

 aWolahris (Baker). 



mm. 



mm. ; diameter 12 

 Alleghenies. 



P. albolabris (Say) (Fig. 805). Shell yellowish-brown in color, 

 with 5 or 6 whorls; umbilicus closed; aperture without teeth or with a 

 slight one on tlie parietal wall; peristome flat, white, and very widely 

 reflected; height 24 mm.; diameter 30 mm.: usually very common in 

 eastern and central United States. 



P. multilineata (Say). Shell yellowish-brown, striped with numer- 

 ous narrow revolving dark bands; aperture without teeth; peristome 



