OPIKATIA [O. emaciata] Kay 1940a, p.264 [Beyrichiidae-- 
Beyrichiinae by Kay; Beyrichiacea of uncertain 
family by Henningsmoen 1953,pe274) Ordovician, 
Iowa. 

OPIKELLA [0. tvaerensis] Thorslund 1940,p.181 [Kirkbyidae 
by Thorslund; Leperditellidae by Agnew; Eurychilinidae-} 
Eurychilininae by Henningsmoen 1953,p.228,230,268] 
Ordovician, Sweden. 
GPIKIUM [Biflabellum tenerum Opik 1935,p.86,f.40) Agnew 1942, 
p.-759, [new name for Biflabellum Opik 1935, not 
Doederlein 1913] Ordovician, Estonia. 
OPIKUM Henningsmoen 1953,p.267 = Opikium Agnew 1942. 
OPISTHOPLAX [0. compressa] Kummerow 1943,p.40 [Primitiidae 
by Kummerow] Gotlandian, Pomerania. 
OROZOE [0O. mira] Barrande 1872, p. 537 [= a Leperditioid 
Phyllopod by Jones 1883, p.461) 
ORTHOCONCHOECIA [for 0. haddoni (Brady-Norm.), striosa (Cls.), 
striola (MUl1.) atlantica (Lubb.), and orthotrichota 
(Miill.), species formerly described under Con- 
choecia] Granata and Caporiacco 1949,p.12,15,16,22 
{Halocypridae by G&C] Recent, Mediterranean. 
ee ee = _ 
132 
