The Nautilus. 



Vol. XIX. NOVEMBER, 1905. No. 7. 



DESCRIPTIONS OF TWO NEW FORMS OF POLYGYRA. 



BY GEO. H. CLAPP. 



Polygyra smithii n. sp. Plate III, figs. 1-4. 1 



Shell imperforate, depressed, thin, horn-color, densely covered with 

 elevated epidermal processes, giving the shell a scaly appearance, the 

 hairs following the weak growth lines; embryonic whorls sculptured 

 with elongate granules ; spire low, convex, rounded, sutures well 

 impressed, whorls about 5^; body-whorl obtusely carinated above the 

 periphery in its first third; rounded, swollen and very deeply constricted 

 back of the peristome, sharply descending in front ; upper half of the 

 aperture, viewed from the under side, forming a half circle ; below 

 the periphery almost straight, so that the whole effect is like a human 

 ear ; lip wide, white, concave above and flat below, at the periphery 

 a wide, flat entering tooth, basal lip straight, slightly thickened on 

 the upper margin ; parietal wall bearing a large, high, very slightly 

 curved tooth extending from the lip-tooth to the axis, a thin wash of 

 whitish callus connecting the upper and lower ends of the lip. 



Gr. diam. 16|, lesser 14, alt. 10 mm. 



Gr. diam. 15^, lesser 13^, alt. 9 mm. 



Gr. diam. 15, lesser 13, alt. 8^ mm. 



Gr. diam. 14^, lesser 12^, alt. 8^ mm. 



Gr. diam. 13^, lesser 11|, alt. 7^ mm. 



The first and last measurements given are the extremes of a con- 

 siderable series, the average size being about 15 mm. 



Near the top of Monte Sano, at an altitude of about 1,600 feet, 

 about 5 miles east of Huntsville, Ala., under large logs, piles of 

 stones, etc. 



1 This plate will appear in a future number. 



