THE NAUTILUS. 65 



From pink loess at Edgemont, St. Glair Co., north side of 

 interurban railway. 



Polygyra profunda pleistocenica Baker. Rare. 



Zonitoides arborea (Say). One specimen. 



From lower part of buff loess at Edgemont, St. Clair Co., 

 north side interurban railway. 



Pyramidula shimekii (Pilsbry). A few very large specimens, 

 one individual measuring 7.10 mm. in greatest diameter. 



Succinea ovalis Say. The Succineas are apparently this 

 species, although they exhibit some variation, especially in the 

 height of the spire. They are not grosvenorii, which occurs in 

 the loess deposits of Iowa. 



DESCRIPTION OF NEW VARIETIES. 



Polygyra midtilineata altonensis n. var. 



Shell differing from typical multilineata in being larger, the 

 whorls more gibbous, the spire more depressed, and the sutures 

 between the later whorls more deeply impressed; the last whorl 

 begins to rapidly descend on the previous whorl until the upper 

 part of the outer lip rests against the periphery, instead of 

 above this point, as in midtilineata ; the deflection of the upper 

 part of the whorl toward the aperture is also more abrupt, and 

 forms a distinct shoulder at this point; the reflected lip is much 

 heavier as is also the umbilical callus; the spiral color bands 

 and lines are apparently much less numerous than in typical 

 midtilineata. 



Greatest diameter, 32; height, 19.5; aperture height, 14; 

 breadth, 14 mm. Holotype. U. I. No. P. 740 A. 



Greatest diameter, 28; height, 15.5; aperture height, 11; 

 breadth, 12 mm. Paratype. U. I. No. P. 740 B. 



Horizon: Lower ten feet of pink loess, plant No. 2 Missis- 

 sippi Lime and Materials Co., Alton, Madison Co., Illinois. 



This form of multilineata is so uniformly different from the 

 usual form and size of this species that it seems to require a 

 special designation. It probably occurs in other loess deposits. 

 The greater size and gibbous-shaped whorls are sufficiently 

 characteristic to cause its immediate recognition. This variety 

 is apparently not common in these loess deposits, only four 



