69 
932 Muricidea lurida Middendorf. 
Sitka, Alaska, to Catalina Island, California. 
Synonym of Ocinebra lurida. 
933 Muricidea poulsoni Carpenter. 
Synonym of Ocinebra poulsoni. 
934 Muricidea salebrosa King. 
Cedros Island, Lower California, to Galapagos Islands. 
935 Muricidea squamulifera Carpenter. 
Balenas bay, California, to La Paz, Baja Cal. 
936 Mya arenaria Linne. 
Circumboreal—Finland to British Isles—Greenland to South 
Carolina—south to Hakododi, Japan, and Sitka, Alaska. Natural- 
ized in San Francisco bay, California. 
937 Mya truncata Linne. 
Circumboreal—Finland to British Isles—Greenland to Massa- 
chusetts—south to Okhotsk sea and Puget Sound, Washington. 
938 Nassa complanata Powys. 
Cedros Island, Lower Cal., to West Colombia, S. America. 
939 Nassa insculpta Carpenter. 
Catalina Island, California. 
940 Natica lewisi Gould. 
Vancouver Island to San Diego, Cal. 
941 Natica marocriensis Gmelin. 
Circumtropical—Southern Europe to Canary Islands—South 
Carolina to West Indies—Cedros Islands, Lower California, to 
Ecuador, South America—Polynesia—China—East Indies. 
942 Natica pallida Broderip. 
Circumboreal?—-south to Catalina Island?, California—Ok- 
hotsk sea, Asia. 
943 Navarchus inermis J. G. Cooper. 
“One small specimen dredged among seaweeds in 10 fathoms, 
near the eastern shore of the ‘Isthmus’ of Catalina Island shows 
no variation from San Diego specimens.’’—Cp. Cal ac pr 3:58. 
Under Strategus inermis:—‘‘Vinous purple, ornamented with 
uumerous rounded or oblong yellow spots: inner surface of en- 
veloping folds, flesh-color. Edge of mantle and tail orange, with 
a narrow band of rich blue, forming a scolloped edging alternately 
blue and gold; a row of alternatng spots of the same along the 
center of the ear-like processes. Under surface of tail deep pur- 
plish-blue. Whole surface perfectly smooth and shining. Eyes 
white with a black pupil. Length 3%, breadth % inch. This 
beautiful animal inhabits muddy parts of San Diego bay, where I 
found it not uncommon in spring. It creeps among the grasses 
slowly and looks like a large caterpillar. Though without any 
apparent means of escape or defense, it seems little molested by 
other animals. As an object for study in an aquarium for the in- 
vestigation of the metamorphoses it doubtless undergoes, from 
the egg to its perfect state, it would be highly interesting. It is 
more highly organized than any other genus of Opistho-branch- 
iata, resembling Aplysia more nearly than any other, and prob- 
ably carnivorous or a carrion eater.’’—Cp., Cal ac pr 2:202. 
944 Nucula expansa Reeve. 
Aleutian Islands to Kamtschatka and Sitka, Alaska. 
945 Ocinebra circumtexta 
Shell ovate, solid, sub-turreted, of 5 convex whorls. Upper 
