50 THE NAUTILUS. 



bed does between two strata of marl, it arouses consider- 

 able interest as to the method of its formation and also that of 

 the bed of marl above and below the moss. Professor Berry 

 says of this species " this moss is very common and wide-spread 

 in middle latitudes and may possibly be a composite form. 

 It grows in various moist (not necessarily swamp) situations 

 from the Atlantic to the Pacific." 



The deposits are all post-glacial and probably represent 

 fluctuations in a water body, possibly connected with the Fox 

 River Valley. The thickness of the moss (two feet) suggests a 

 comparatively long period of swampy condition between two 

 pond formations. The mollusks are indicative of a water body 

 four to eight feet in depth. Samples were not secured of the 

 marl beneath the moss, which probably also contained mol- 

 lusks. 



The whole Fox River Valley is worthy of study, the lower 

 part of the river bank bearing strata belonging to the Sangamon 

 or Post-Illinoian interglacial interval, which are fossil-bearing. 

 In view of the rich beds of molluscan fossils found near Chicago, 

 it would seem that these Fox River strata should be investigated, 

 as they may also contain remains of life indicating something 

 of the migration of life during this interesting interval, when 

 the great shell beds of Toronto were formed. 



The New York State College of Forestry. 

 Syracuse University. 



THE GASTROPODA OF PAYNE COUNTY, OKLAHOMA. 



BY DARLING K. GREGER, COLUMBIA, MISSOURI. 



The collection upon which the list of species given below is 

 based was made in the month of May, during a season of abnor- 

 mally wet weather. While we covered practically the whole of 

 Payne county, the region between Wild Horse and Stillwater 

 creeks and from the Cimarron River north to the town of Still- 

 water was studied quite thoroughly during the period of our 

 stay. 



Of the nine families represented in the region, the Helicida 



