Leptachatina ovata C.M. Cooke, 1910
Amastra ovatula C.M. Cooke, 1933
Leptachatina pachystoma W.H. Pease, 1879
Amastra pagodula C.M. Cooke, 1917
Carelia paradoxa (L. Pfeiffer, 1854)
Amastra paulula C.M. Cooke, 1917
Planamastra peaseana H.A. Pilsbry, 1911
Amastra peasei E.A. Smith, 1873
Amastra pellucida D.D. Baldwin, 1895
Leptachatina perforata C.M. Cooke, 1911
Carelia periscelis C.M. Cooke, 1931
Leptachatina perkinsi E.R. Sykes, 1896
Leptachatina persubtilis C.M. Cooke, 1910
Amastra perversa A. Hyatt & H.A. Pilsbry,1911
Armsia petasus (C.M.F. Ancey, 1899)
Leptachatina petila J.T. Gulick, 1856
Amastra petricola W. Newcomb, 1855
Laminella picta (J.W. Mighels, 1848)
Carelia pilsbryi E.R. Sykes, 1909
Amastra platyla (C.M.F. Ancey, 1889)
Leptachatina popouwelensis H.A. Pilsbry & C.M. Cooke,1914
Amastra porcus A. Hyatt & H.A. Pilsbry,1911
Amastra porphyrea (W. Newcomb, 1853)
Amastra porphyrostoma W.H. Pease, 1869
Amastra praeopima C.M. Cooke, 1917
Leptachatina praestabilis C.M. Cooke, 1910
Amastra problematica C.M. Cooke, 1933
Leptachatina pulchra C.M. Cooke, 1910
Amastra pullata D.D. Baldwin, 1895
Amastra pullata umbrosa D.D. Baldwin, 1895
Leptachatina pumicata (J.W. Mighels, 1845)
Leptachatina pupoidea C.M. Cooke, 1911
Amastra pusilla W. Newcomb, 1855
Leptachatina pyramis (L. Pfeiffer, 1846)
Laminella remyi W. Newcomb, 1855