THE NATURAL HISTORY SURVEY. 163 



young are difficult to distinguish from profunda ; the bands, 

 however, are more numerous in the present species than in pro- 

 funda (see the latter species for additional remarks). This is 

 not a common mollusk and is limited in distribution to the 

 southern and western regions. It frequents marshy woodlands 

 and loves to be where there is plenty of water, moisture seem- 

 ing to be a necessity to its existence. It is one of the most 

 beautiful of the larger Helices. At Joliet it ranges in color 

 from almost pure white, without bands, through various shades 

 of horn to dark purplish or blackish, with bands; the latter 

 exhibit every variety of width and number. 



60a. Polygyra multilineata alba Witter. 



Helix multilineata var. alba WITTER, Journ. of Conch., Vol. I, p. 384, 



1878. 

 6ob. Polygyra multilineata rubra Witter. 



Helix multilineata var. rubra, WITTER, 1. c., p. 384, 1878. 

 The varieties alba and rubra are found somewhat sparingly 

 at Joliet. The first has a perfectly plain horn-colored shell 

 and the latter a plain reddish or chestnut-colored shell, which 

 is very beautiful. 



SECTION STENOTREMA Rafmesque. 

 Shell: "Small, compact, imperforate or umbilicate; sub- 

 globose, globose-depressed or lens-shaped the periphery vary- 

 ing from rounded to acutely keeled; surface dull, smooth , gener- 

 ally hairy. Whorls 5-6, closely revolving, the last suddenly de- 

 flexed in front. Aperture basal, narrow, obstructed by an oblique 

 blade-like parietal tooth parallel to the reflexed basal lip, the latter 

 often notched in the middle. Last whorl generally having in 

 its last fourth a short transverse partition on the axis." "Gen- 

 ital system having the penis notably longer than the recep- 

 taculum semmis and its duct, the latter quite short." (Pilsbry, 

 1. c., p. 77.) 



61. Polygyra hirsuta Say, pi. xxix, fig. 9. 



Helix hirsuta SAY, Journ. Phil. Acad., Vol. I, p. 17, 1817. 



Helix ? porcina SAY, Long's Exped., Vol. II, p. 257, pi. xv, fig. 2, 1824. 

 (Young.) 



Helix fraterna WOOD, Index, Suppl., p. 21, pi. viii, fig. 16, 1828. 



Helix sinuata GMELIN (teste Pfeiffer). 



Helix isognomostomos GMELIN (teste Pfeiffer). 



Polygyra hirsuta altispira PILSBRY, The Nautilus, Vol. VII, p. 141, 

 1894. (Variety.) 



Polygyra hirsuta pilula PILSBRY, Proc. Phil. Acad., p. 132, 1900. (Va- 

 riety.) 



Polygyra hirsuta uncifera PILSBRY, 1. c., p. 453, 1900. (Variety.) 



