348 The American Geologist. Dowmber. looi 
''•''"ZONITOIDKS MlNl'SCTLUS (Billll.) J'ils. 
Common under stones, etc. t)n hio-her slopes, and nnder 
sticks, leaves, etc. on lower grounds. Rare in the loess. 
b. Species of higher, more deeply shaded (often mossy 
and rocky) banks and slopes, sometimes in deep 
woods. 
'''*Helicina occulta Say. 
This species, though a prosol)ranch, is strictly terrestrial 
in its habits. It is found living in l)ut one locality, a steep, 
rocky northern slope near Turkey creek, six miles north of 
Towa City, the locality in which it was first discovered by the 
writer about twenty-two years ago. It is quite abundant in 
this very restricted locality, being found under stones and 
fallen leaves. It is very common in the loess, and is found in 
nearly all the exposures. The body-whorl of the fossil shell 
sometimes still contains the operculum. 
The writer recently found this species (living) common 
on the rocky slopes along Pine Hollow creek in Dubuque 
county, and Little Turkey river and its small tributaries in 
Clayton county, Iowa localities not hitherto reported. 
'■''^POLYGYRA PROFUNDA (Soy) PUs. 
Common under sticks, stones, leaves, etc. on higher 
shaded slopes. It is found in but one loess-exposure in this 
vicinity, but is very common in the loess of Natchez, Miss. 
*POLYGYRA CLAUSA (Say) Pils. 
Widely distributed in deeper woods near Iowa City, but 
nowhere common. As a fossil it is rare, occurring occasion- 
ally in more southerly loess. None have been found at low^a 
City. 
*P0LYGYRA HIRSUTA {Say) PUs. 
Locally quite widely distributed in deeper woods, thoug'h 
never gregarious. Fossil shells are found sparingly in the 
western loess at Council Bluffs, Iowa. 
*POLYGYRA MONODON (Rack.) PUs. 
This species is very similar to the preceding in its habits, 
and in the distribution of both the recent and fossil forms, 
both, however, being rather more abundant. Neither has been 
found fossil at Iowa City, though their discovery would not be 
surprising. Common in the loess at Natchez, Miss., and also 
fossil in Indiana. 
