Philobrya obesa (A.W.B. Powell, 1958)
Lissarca obsoleta (FOSSIL) (C.R. Laws, 1944 †)
Cratis ohashii I. Hayami & T. Kase, 1993
Philobrya olstadi (T. Soot-Ryen, 1951)
Cosa orbicula (FOSSIL) C.R. Laws, 1950 †
Adacnarca ornata (M.A. Crozier, 1966)
Cratis ovata (FOSSIL) J. Marwick, 1931 †
Cosa pacifica (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Cosa parallelogramma (C. Hedley, 1906)
Cosa paramoea (P. Bartsch, 1915)
Aupouria parvula A.W.B. Powell, 1937
Cosa pectinata (C. Hedley, 1902)
Cratis pentodon (C.G. Aguayo & P.J. Borro,1946)
Cosa pharetra T. Iredale, 1931
Lissarca picta (C. Hedley, 1899)
Cosa pileata (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Adacnarca pileopsis (A.W.B. Powell, 1927)
Philobrya pinctada (H.J. Finlay, 1930)
Philobrya pinctagrina (FOSSIL) (C.R. Laws, 1936 †)
Lissarca pisum H.H. Suter, 1913
Cratis pliocenica (FOSSIL) C.R. Laws, 1936 †
Adacnarca polarsterni E.N. Egorova, 2003
Cosa praeuntia (FOSSIL) (Tate 1898) †
Aupouria pristina (FOSSIL) P.A. Maxwell, 1969 †
Cratis progressa C. Hedley, 1915
Lissarca pulchra (FOSSIL) (P.A. Maxwell, 1969 †)
Limopsilla pumilio (E.A. Smith, 1904)
Philobrya quadrata (G.J. Pfeffer in E.C. Von Martens& G.J. Pfeffer, 1886)
Cratis recapitula (C. Hedley, 1906)
Cratis retiaria A.W.B. Powell, 1937
Lissarca rhomboidalis J.C. Verco, 1907
Philobrya robensis (B.C. Cotton, 1931)
Aupouria rotunda (FOSSIL) C.R. Laws, 1940 †
Philobrya rubra (C. Hedley, 1904)
Lissarca rubricata (R. Tate, 1887)