Genus Pseudamussium H. & A. Adams 1858 57 



Subgenus Peplum Bucquoy, Dautzenberg & Dollfus 1889 63 



Pseudamussium (Peplum) fasciculatum (Hinds) 1845 .... 65 



Genus Cfilamys Roding 1798 66 



Chlamys islandica (Miiller) 1776 69 



Chlamys islandica albida (Dall in Arnold) 1906 72 



Chlamys islandica behringiana (Middendorff) 1849 73 



Chlamys rubida (Hinds) 1845 76 



Chlamys rubida jordani (Arnold) 1903 79 



Chlamys patagonica (King) 1831 81 



Chlamys amandi (Hertlein) 1935 83 



Chlamys hastata (Sowerby) 1842 84 



Chlamys hastata hericia (Gould) 1850 87 



Chlamys hastata pugetensis (Oldroyd) 1920 90 



Chlamys loivei (Hertlein) 1935 91 



Subgenus Argopecten Monterosato 1889 93 



Chlamys (Argopecten) circularis (Sowerby) 1835 97 



Chlamys (Argopecten) circularis aequisulcata (Carpenter) 1864 . . 100 



Chlamys (Argopecten) purpurata (Lamarck) 1819 103 



Subgenus Leptopecten Verrill 1897 105 



Chlamys (Leptopecten) latiaurata (Conrad) 1837 107 



Chlamys (Leptopecten) latiaurata monotimeris (Conrad) 1837 . . 110 



Chlamys (Leptopecten) palmeri (Dall) 1897 113 



Chlamys (Leptopecten) velero (Hertlein) 1935 114 



Chlamys (Leptopecten) velero biolleyi (Hertlein & Strong) 1946 . . 115 



Chlamys (Leptopecten) euterpes (Berry) 1957 117 



Chlamys (Leptopecten) tmnbezensis (d'Orbigny) 1846 .... 118 



Genus Semipallium Jousseaume in Lamy 1928 120 



Semipallium zeteki (Hertlein) 1935 122 



Subgenus Juxtamusium Iredale 1939 123 



Semipallium (Juxtamusium) natans (Philippi) 1845 125 



Genus Nodipecten Dall 1898 127 



Nodipecten subnodosus (Sowerby) 1835 128 



Nodipecten magnificus (Sowerby) 1835 132 



Genus Hinnites Defrance 1821 133 



Hinnites multirugosus (Gale) 1928 134 



VI 



