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21:1001 Leda dalli Krause, 1886. 
Unalaska, Aleutian Islands. 
21:1002 Leda extenuata Dall, 1897. Off Sitka, Alaska. 
21:1003 Leda caelata Hinds, is L. taphria Dall. 317. 
21:1004 Lamellaria depressa Dall, MS, is L. stearnsili. 
21:1005 Lasaea rubra subviridis Cpr. Color form? 
21:1006 Lazaria subquadrata Cpr. is Cardita s. 
21:1007 Leda cuneata Hanley. 
21:1008 Lepidopleurus internexus Cpr. 
Shell similar to L. nexus but smaller; valves orange color; 
length 4.5 mm. Santa Barbara, Cal. 
21:1009 Lucina acutilineata Conr. is Phacoides annulatus. 
21:1010 Lucina borealis, is Phacoides annulatus. 
21:1011 Lucina filosa, of Cal. lists is Phacoides annulatus. 
21:1012 Genus Lepton Turton, 1822. 
Shell suborbicular, compressed, smooth, or shagreened, 2 lit- 
tle opened at the ends and longest behind; hinge-teeth 0.1 or 1.1 
in front of an angular cartilage-notch; lateral teeth 2.2 and 1.1. 
21:1013 Genus Limopsis Sassi, 1827. 
Shell orbicular, convex, slightly oblique; ligamental area 
with a triangular cartilage-pit in the center; hinge with 2 equal, 
curved series of transverse teeth. 
21:1014 Limopsis diegensis Dall, 1908. 
Santa Barbara Islands, Cal., to Coronado Islands, Baja Cal. 
21:1015 Genus Liocyma Dall, 1870. 
Shell small, ovate, concentrically striated, compressed, nearly 
equivalve and rather thin; 3 cardinal teeth in each valve, the 
middle one cleft; pallial sinus small. 
21:1016 Genus Lyonsia Turton, 1822. 
Shell nearly equivalve, left largest, thin, subnacreous, close, 
truncated posteriorly; cartilage plates oblique, covered by an 
oblong ossicle; pallial sinus obscure, angular. © 
21:1017 Lyonsia striata Montagu, 1815. 
Circumboreal, Aleutian Islands to Straits of Fuca. 
21:1018 Lyonsia arenosa Moller, 1842. 
Circumboreal. Arctic Sea, Japan, Okhotsk Sea; Aleutians 
and Kadiak Island, Alaska. 
21:1019 Lyonsia gouldii Dall, 1915. 
San Francisco bay, Cal., to Point Abreojos, Baja Cal. 
21:1020 Lyonsia californica Conrad, 1837. 105. 
Puget Sound, to Todos Sontos bay, Baja Cal. 
21:1021 Lyonsia californica haroldi Dall, 1915. 
Central Californica. 
