IOWA ACADEMY OP SCIENCES. 



43 



sheets which during the deposition of the loess were found at 

 the surface of adjacent regions. This would involve a careful 

 comparison of the finer materials in the drift with the loess, 

 and the consideration of the probable or possible direction and 

 means of transportation to the present location of the loess. 



TABLE I. 

 LIST OF LOESS FOSSILS [Mollusca). 



Eastern 



TERRESTRIAL FORMS LoeSS. 



Zonites radiatulus Alder 2 



Zonites arboreus (Say) Binn 



Zonites minusculus (Binn.) F. & C 3 



Zonites shimekii Pils. (nitidus) 98 



Zonites fulv us (Drap.) Binn 140 



Zonites binneyanus {Movse) Binn reported (1) 



Zonites indentatus (Say) Binn reported (2) 



JSelicodiscus Uneatus (Say) Morse 13 



Patula strigoka cooperi W. G. B 85 



Patula striatella ( Anth ) Morse 288 



Patula striatella eggs (3) 6 



Patula alternata (Say) Binn 61 



Patula perspectiva (Say) Binn. Reported (1) 



MacrocycUs concava (Say) Morse. Reported (2) 



Stenotrema leaii (Ward) Binn. [monodon] 



Stenotrema hirsutuni (Say) Pry 



Mesodon multilineata (Say) Pry 103 



Mesodon albolabris (Say) Morse 



Mesodon profunda (Say) Binn 61 



Mesodon thyroides (Say) Pry. Reported (2) 



Mesodon dausa (Say) Pry 1 



Mesodon divesta (Gld. ) Pry. Reported (1) 



Vallonia pulchella (Muell.) Binn 66 



Strobila labyrinthica (Say) Morse 



Fernesacia subcylindrica (L.) Binn 12 



Pupa holzinqeri Sterki 



Pupa arniifera Say 14 



Pupa muscorum L 72 



Pupa contracta Say '. 



Pupa alticola Inger. [simplex) 247 



Pupa fallax Say 



Pupa corticaria Say. Reported (4) 



Other Pujndm (5) 378 



S'uccinea ovalis Gld 



Otner Succinem (6) 1.200 



Carychium exiguum (Say) Gld 9 



Helicina occulta Say 180 



Pomaliopsis lapidaria Say (7) 



Total terrestrial forms 3,039 



150 



330 



1,777 4,816 



