LOESS FOSSILS. 

 Lists of loess fossils — Continued. 



169 



Names heretofore commonly used. 



JiPilsbry and Johnson's check 



list of terrestrial mollusks for 1898. 



List IV. From Muscatine, Iowa. 

 (Identified by F. M. Witter; 

 revised by B. Shimek.) — Con- 

 tinued. 



List V. From Burlington, Iowa. 

 (CoUected by Frank Leverett ; 

 identified by C. T. Simpson.) 



Succinea obliqua Say. 

 Helicina occulta Say. 



List VI. From near Freeport, 

 Illinois. (Collected by Oscar 

 Hersbey ; identified by W. H. 

 Dall.)6. 1. Terrestrial species, 



Succinea obliqua Say 



Helicina occulta Say 



Limnaea humilis Say 



Unio obenus Lea 



Unio ligamenti nus Lea 



Unio rectus Lam 



Campeloma subsolidum (Anth.) 



Call; also Melantho subsolida. 

 Margaritana confragosa Say. 



Succinea obliqua Say 



Succinea lineata W. G. B 



Helicina occulta Say 



Patula strigosa cooperi W. G. B. ; 



also Pyramidula strigosa. 

 Pyramidula striatella Anth. ; also 



Patula striatella (Antb.) Morse. 

 Pyramidula perspectiva (S a y) 



Binn. 

 Vallonia costata Mull. ; also Vallo- 



nia pulchella var. costata. 



Vallonia perspectiva Sterki Vallonia perspectiva Sterki. 



Zonitoides arboreus Say; al so Zonitoidesarboreus(Say)P.&J. 



Zonites arboreus (Say) Binn. 



Succinea obliqua Say. 

 Succinea grosvenorii Lea. 

 Helicina occulta Say. 

 Pyramidula strigosa iowensis 



Pils. 

 Pyramidula striatella (Anth.) 



Pils. 

 Pyramidula perspectiva (Say) 



Pils. 

 Vallonia costata Mull, a 



Zonites radiatulus Aid ; also Hya- 



lina radiatula Aid. 

 Zonites minusculus Binn; also 



Hyalina minuscula Binn. 

 Zonites indentatus (Say) Binn; 



also Hyalina indentata Say. 

 Patula alternata (Say) Binn; also 



Pyramidula alternata Say. 

 Patula striatella (Anth.) Morse; 



also Pyramidula striatella 



(Anth.) Morse. 

 Helicodiscus lineatus (Say) Morse. Helicodiscus 



Morse. 

 Stenotrema hirsutum (Say) Try. ; Polygyra hirsuta (Say) Pils. 



also Polygyra hirsuta Say. 



a It is now difficult to ascertain the correctness of the earlier identifications of the species of Yallonia. The species 

 were all formerly referred to Y. pulchella or to Y. pulchella var. costata, hut Dr. Sterki's investigations have brought to 

 light a greater number of species than was at first recognized. Most of the forms formerly called V. pulchella from the 

 loess west of the Mississippi are Y. gracilicosta, and those called Y. pulchella var. costata are at least in part T. parvula 

 Sterki. This difficulty in making the identifications does not in any manner affect the general discussion, as all the species 

 are strictly terrestrial in habit. (Shimek.) 



b Published in Am. Jour. Sci., 4th series, Vol. IV, 1897. 



Vitrea hammonis (Striim.) 



P. & J. 

 Zonitoides minusculus (Binn.) 



P. &J. 

 Vitrea indentata (Say) P. & J. 



Pyramidula alternata (Say) 



Pils. 

 Pyramidula striatella (Anth.) 



Pils. 



lineatus (Say) 



