206 NATURAL HISTORY BULLETIN. 



leaves in low, wet places. It has not been found in the 

 loess. 



**POLYGYRA MULTILIXEATA (Say) Pih. 



The smaller form, already mentioned, is not uncommon 

 along the edges of a prairie swamp near Iowa City. It is 

 almost exactly like the locally more common fossil form of 

 this species. This small form is also common in other 

 portions of the State, — especially westward. 



*SUCCINEA RETUSA Lea . 



This species is now common on mud, etc. among plants 

 in swampy places. The large variety m agister Pils. is the 

 common form. A few fragmentary specimens of young 

 shells from the loess of Nebraska are in the writer's 

 possession. They are probably young shells of the 

 variety. None have been found at Iowa City. 



**Succixea sp. (?). 



A rather large Succinea, which has not yet been satis- 

 factorily placed, is quite common on bare mud-flats along 

 streams, and also occurs in the local loess. In some 

 respects it is intermediate between .S\ avara and ^T. obliqua, 

 sometimes approaching the smaller, more slender forms 

 of the latter species quite closely. 



The foregoing species are wholly terrestrial in habit, and 

 moreover, with few exceptions flourish in comparatively 

 dry situations. While all require a certain amount of 

 moisture when active, the lower surface of a fallen leaf, a 

 stick, or a stone, even in a comparatively exposed place, 

 furnishes all that is necessary. 



The following summary of the preceding notes is of 



interest: 



Species found at Iowa City only as fossils ... 6 



Species found here both living- and fossil . . . .19 

 Species now found living here, but occurring as fossils 



in the loess of other localities 19 



Species living here, but not yet reported from the loess 3 



Total 47 



