IOWA ACADEMY OF 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 Western 



TERRESTRIAL FORMS Loess. Loess Total. 



Zonites radiatulus Alder 2 9 11 



Zonites arboreus (Say) Binn 10 10 



Zonites minusculus (Binn.) P. & C 3 3 6 



Zonites shimekii Pils. {nitidus) 98 74 172 



Zonites fulvus (Drap.) Binn 140 28 168 



Zonites bintieyanus {Morse) Binn reported (1) 



Zonites indentatus (Say) Binn reported (2) 



Helicodiscus lineatus (Say) Morse 13 10 23 



Patula strigobu cooperi W. G. B 85 85 



Patula striatella ( Anth ) Morse 288 206 494 



Patula striatella eggs (3) 6 14 20 



Patula alternata (Say) Binn 61 54 115 



Patula perspectiva (Say) Binn. Reported (1) 



Macrocyclis concava (Say) Morse. Reported (2) 



Stenotrema leaii (Ward) Binn. {monodon) 24 24 



Stenotrema hirsutum (Say) Fry 3 3 



Mesodon multilineata (Say) Fry 103 42 145 



Mesodon albolabris (Say) Morse 2 2 



Mesodon profunda (Say) Binn 61 3 64 



3Iesodon thyroides (Say) Fry. Reported (2) ' 



Mesodon dausa (Say) Fry 1 1 



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



Vallonia pulchella (Muell.) Binn 66 190 256 



Strobila labyrinthica (Say) Morse 2 2 



Fernesacia svbcylindrica (L.) Binn 12 16 28 



Pupa holzinqeri Sterki 3 3 



Pupa armifera Say 14 11 25 



Pujm muscorum L 72 183 255 



Pupa contracta Say 1 1 



Pupa alticola Inger. [simplex) 247 50 297 



Pupa fallax Say 12 12 



Puim corticaria Say. Reported (4) 



Other Pupidoi (5) 378 160 538 



Succinea ovalis Gld 3 3 



Otner Succimoi (6) 1.200 514 1,714 



Carychium exiguum (Say) Gld 9 9 



Helicina occulta Say 180 150 330 



Pomatiopsis lapidaria Say (7) 



Total terrestrial forms 3,039 1,777 4,816 



