Pars 22 Ancylus 1691 
1867 Ancylus minutulus, Conrad, (67b) Smithsonian miscellaneous 
Collections VII, No. 200, (1866), p. 10. 
1876 Acroloxus minutus, Meek, (76a) Report U. S. Geol Survey of 
the Territories IX, p. 543, tab. XLIV, fig. 10. 
1877 Acroloxus minutus, White, (77c) Bull. U. S. Geol. and Geogr. 
Survey of the Territories III, p. 613. 
1880 Acroloxus minutus, S. A. Miller, (79a) The Journ. of the Cin- 
cinnati Soc. of Nat. Hist. III, (1880), p. 21. 
1883 Acroloxus minutus, White, (83a) Report U. S. Geol. Survey III, 
(1882), p. 451, tab. XXIV, fig. 27. 
1883  Acroloxus minutus, White, (83c) XIIth Annual Rep. U. S. Geol. 
and Geogr. Survey of the Territories I, p. 83. 
Vorkommen: U. Paleocán, Thanétien: Fort Union beds: 
Fort Union (Dakota). 


SPECIES 
Aquitanien 
Plaisancien 
Thanétien 
Sparnacien 
Yprésien 
Lutétien 
Sarmatien 
Astien 


Pontien 
arenarius 

minutus 
matheroni 
matberoni 
actinophorus 
matheroni 
]emoinei 
—|—id——|1——i1—1——1i 

berellensis 
dutemplei 

elegans 
brauni 
cf. elegans — 

boyeri 
boettgeri 


depressus 


decussatus 

bourgeoisi 


deperdito- 
Jacustris 
croaticus 


involutus 


michaudi 

lacustris 
