ACRATIA [A. typica] Delo 1930,p.174 [Bairdiidae by Delo] 
Pennsylvanian, Texas. 
ACRONOTELLA [A. shideleri] Ulrich and Bassler 1923,p.299, 
302 [Primitiidae by Bassler and Kellett 1934,p.l9, 
146; Hollinidae-Ctenentominae by Schmidt 1941, 
Ppe343 Acronotellidae by Henningsmoen 1953,p.23h, 
269] Silurian, Indiana. 
ACRONOTELLIDAE Swartz 1936,p.e554 a family to include 
Acronotella, Eoconchoecia, Monoceratina, Mooreina. 
ACROSSULA [A. u-scripta] Kummerow 1953,pe42 [Piretellidae by 
Kummerow] Devonian, Germany. 
ACROTONELLA Peneau 1927,p.e112 [?= Acronotella by Bassler and 
Kellett 1934,p.146] 
ACTINOCYTHEREIS [Cythere exanthemata Ulrich and Bassler 190k, 
pell7,pl.36,f.-1-5] Puri 1953a,p.178 [Cytheridae] 
Miocene, Maryland. Range Eocene to Recent. 
ACUTICYTHEREIS [A. laevissima] Edwards 1944,p.519 
[Cytheridae by Edwards] Miocene, North Carolina. 
(= Campylocythere Edwards, by Malkin 1953,p.764] 
AECHMINA [A. cuspidata] Jones and Holl 1869,p.217 [Leper- 
ditidae by Ulrich 1894,p.632; Cytheridae by Jones 
1901,pe147; Primitiidae-Primitiinae by Bassler and 
Kellett 1934,pe19; Aechminidae by Swartz 1936, 
pe564; Drepanellidae-?Aechmininae by Henningsmoen 
1953,pe234,269] Silurian, England. 
