8.1.Cat. 
17. 
ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 585 
no. 
33. Yoldia limatula, Say. Awatska Bay and Arctic Oc. Mud, common, 5-20 fm. 
1734. 
1735. 
1736. 
1737. 
1740. 
1741. 
1742. 
1744. 
1745. 
1747. 
1748, 
1749, 
1750. 
1751. 
1752. 
1753. 
1764. 
1756. 
1757. 
1768. 
1759. 
1760. 
1761. 
1762. 
1763. 
1765. 
1770. 
1771. 
1773. 
1774. 
1775. 
1776. 
LUCE. 
1778. 
1781. 
1783. 
1784. 
1785. 
1789. 
1790. 
1791. 
1793. 
1796. 
1798. 
1799. 
1821. 
1836. 
1837. 
1838. 
Natica clausa, Brod. Awatska Bay. Mud, 5-15 fm. 
Yoldia myalis (or hyperborea). Awatska Bay. Mud, 10 fm. 
Leda minuta. Seniavine Str. ; Arctic Oc., near Behr. Str. Mud and pebbly 
sand, 15-30 fm., coarse striae. 
Leda minuta, var. Ditto. Mud and pebbly sand, 5-20 fm., fine strie. 
Modrolaria corrugata. Ditto. Mud, in nests, 30 fm. 
Rhynchonella psittacea. Ditto. Graveland sponges, 20-30 fm. 
Margarita striata, Leach. Ditto. Shelly gravel, common, 15-30 fm. 
Admete arctica, Midd. Ditto. Mud, 30 fm. 
Admete viridula, Couth. Ditto. Gravel, 4 fm.; mud, 10-30 fm. 
Velutina haliotoidea. Ditto. Gravel, 10-25 fm. 
Margarita argentata {Gld. Iny. Mass.]. Ditto. Mud, 30 fm.; shelly, 15- 
25 fm. 
Turritella (sp.), Migh. Ditto. Mud, 30 fm.; clean gravel, 4-20 fm. 
Trichotropis bicarinata. Ditto. Pebbly mud, 5-6 fm. 
LInnatia pallida, Brod. Ditto. Mud, 10-80 fm. 
Cylichna triticea, Couth. Ditto. Mud, 15-30 fm. 
Velutina {| Morvilia] zonata [Gld. Iny. Mass.]._ Ditto. On stones, 5 fm. 
Nucula tenuis, Mont. Ditto. Mud, common, 20-30 fm.; pebbly mud, 5-20 
fm. Also Hakodadi; sandy mud, 10 fm.; no. 1687. 
Trophon clathratus, Linn. Ditto. Mud, 20-80 fm.; gravel, 4 fm. 
Lanatia septentrionalis, Beck. Ditto. Gravelly mud, common, 20 fm. ; 
gravel, 4 fm. 
Amicula vestita, Shy. Ditto. Gravel, common, 10-40 fin. 
Scalaria Grenlandica, Chemn. Ditto. Maud, 30 fm. 
LInnatia pallidoides. Ditto. Mud, 30 fm. 
Chrysodomus Islandicus, Chemn. Ditto. Mud, 30 fm. 
Patella | Lepeta| candida, Couth. Ditto. Mud, 30 fm. 
Chiton albus, Linn. Ditto. On shells in mud, 80 fm. 
Chrysodomus Schantaricus, Midd. Ditto. Mud, 20-30 fm. 
Astarte lactea, Br. and Sby. Arctic Oc. Mud, 30 fm. 
Pecten Islandicus, Chemn., var. Arctic Oc. Maud, 30 fm. 
Buceinum ?undatum (probably bicarinate var. of glaciale). Arctic Ocean. 
Buccinum Pundatum, var. pelagica. Arctic Ocean. 
Buccinum ? Ochotense, Midd. Arctic Ocean. 
Buecinum angulosum, Gray (= glaciale, var.). Arctic Ocean. 
Bueccinum ? tenue, Gray. Arctic Ocean. 
Mangelia, like simplex, Midd. Arctic Ocean. 
Bela rufa, Mont. Seniavine Str. Pebbly mud, common, 5 fm. 
Turritella erosa. Seniavine Str. Mud, 10-20 fm. 
Lyonsia Norvegica, Chem. Seniavine Str. Pebbly mud, 5 fim. 
Trichotropis insignis, Midd. Seniavine Str. Gravel, 10 fm. 
Bela decussata, Couth. Seniavine Str. Sandy mud, 10-20 fm. Also Awatska 
Bay ; ne. 1730. 
Yoldia myalis, Couth. Seniavine Str. Mud, 10-20 fm.; pebbly nvd, 5 fm. 
Bela harpularia, Couth. Pebbly mud, 5 fm. 
Margarita helicina, Faby. Behring Str. Clean gravel and alge, 5 fm. 
Turtonia [? minuta, Fabr.]. Behring Str. Common on sponges, 20-40 fm. 
LInmatia | Acrybia| aperta, Lov. (Kamtschatka. 
Modiolaria nigra, Gray. Arctic Ocean. 
Chama lobata {| =exogyra, Jay, non Conr.]. China Sea, west of Formosa. 
Shell-gravel, 30 fm. : 
Purpura emaryinata, Desh. San Francisco. On rocks in 4th level. 
Tittorina plena, Gid. San Francisco. On rocks in 8rd and 4th levels. 
Acmea textilis, Gid. San Francisco. On piles and rocks between tides. 
1838). Acmea patina, Esch. San Francisco. On piles and rocks between tides. 
1859. 
1840. 
1841. 
Cryptomya Californica, Cony. San Francisco. On sandy beaches. 
Macoma nasuta, Cony. San Francisco. Common in sandy mud, 1. w. 10 fm. 
Cardium Nuttall, Cony. San Francisco. Common in sandy mud, 1. w. 10 fm. 
