Loess of lozva City — Shiinek. 351 
distinction between them, however, is not worthy of main- 
tenance, they are here grouped tog-ether. 
c. Terrestrial species of lower, shaded, alluvial 
grounds, under sticks, leaves, etc. 
**PoLYGYRA MULTiLNEATA (Say) PUs. (Large fomi). 
Two forms of this species occur here. The larger, the 
more common form, lives on wooded alluvial bottom-lands 
which are not too dry, and may be found abundantly creeping- 
or hiding among the smaller plants, under fallen leaves, etc. 
Four fossil specimens only were found in one of the expos- 
ures at Iowa City, and it is rare in the loess of the Missouri 
river in eastern Nebraska. The smaller form, discussed un- 
der {d), is much more common in the loess. 
*BiFiDARiA CONTRACTA (Say) Stevki. 
Very common on rather low grounds, under logs, etc.,. 
sometimes ascending to higher slopes. Absent from the local 
loess and rare westward. It is more common in the southern 
loess. 
BiFiDARiA rROCERA (Gld.') Sterki. 
Only one local specimen was collected on rajther low 
ground. Westward this species is quite common in drier sit- 
uations, under sticks and leaves in clumps of bushes, etc. None 
have yet been found in the loess. 
**VlTREA HAMMONIS (StrOlll.) PUs. 
This name is used for the species commonly known as- 
Zonitcs viridulus Mke. on the authority of Pilsbry. Binney 
refers Helix ha Jii mollis Strom, to Zonites fabricii Beck, — a 
species from Greenland.* Our species is quite common under 
logs, etc. on rather low, more or less wooded, grounds. Rather 
rare in the local loess, but more common westward. 
**Pyramidula .striatella (Anth.) Pils. 
Quite common on scantily timbered alluvial bottom-lands,. 
under logs, fallen leaves, etc. Also on higher slopes. As a 
fossil it is very common, and is widely distributed, appearing- 
almost universally in our northern loess deposits. Fossil eggs,, 
agreeing exactly with recent eggs of this species, are also fre- 
quently found. 
**SucciNEA oblioi;a Say. 
Very common under leaves, etc. on timbered alluvial bot- 
•W. G. BiN.NEY, Terr. Air-Breath. Moll. U. S., vol. v, p. 127, 187S. 
