GASTROPODA 



521 



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 very 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). 



Fig. 802 Fig 803 



Fig. 802 Helix hortensis (Binney). Fig. 803 

 Polygyra auriformis (Binney). 



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 yellow; 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 



mm.; diameter 12 mm.: southern and central states west of the 

 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 the 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 



Fig. 804 



Fig. 805 



Fig. 804 Polygyra profunda 

 (Baker). Fig. 80o Polygyra 

 albolabris (Baker). 



