EOCYTHEROPTERON [Cytheropteron bilobatum Alexander 1929, 
pel104,p1.10,f.14,15] Alexander 1933,p.195,196. 
[Subgenus of Cytheropteron by Alexander] Lower 
Cretaceous, Texas. 
EOLEPERDITIA [Cytherina fabulites Conrad 1843,p.332] 
Swartz 1949,p.317 [Leperditiidae-Leperditiinae by 
Swartz] Ordovician, Wisconsin. 
EREMOS [E. bryograptorum] Westergaard,mScr. Moberg and 
Segerberg 1906,p.75,pl.3,f.e2i [Compared to 
Isochilina and Bradoria by authors; Conchostraca 
by Ulrich and Bassler 1931,p.61] Ordovician, 
Sweden. 
ERIDOCHONCHA [E. rugosa] Ulrich and Bassler 1923,p.297 
[Leperditellidae by Bassler and Kellett 1934, 
pe310; Aparchitidae by Kay 1940a,pe2h0,2h7; 
Primitiidae by Levinson 1951,p.556; ?Leperditellidae-- 
?Eridoconchinae by Henningsmoen 1953,p.251,256, 
275.) Ordovician, Ohio. 
?ERIDOCONCHINAE Henningsmoen 1953,p.e255,275, a subfamily of 
?Leperditellidae, for the genera: Eridoconcha, 
Cryptophyllus, Milleratia, Schmidtella, ?Para- 
schmidtella. 
ERIELLA [E. robusta] Stewart and Hendrix 1945a,pe95 
[Quasillitidae by S&H] Devonian, Ohio. 
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