114 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
OPALIA EVICTA De Boury, 1919. 
Journ. de Conchyl., voL /4, No. 1, p. 36. 
Forrester Island, Alaska, to Magdalena Bay, Lower California. 
, Subgenus Dentiscala De Boury, 1886. 
DENTISCALA CRENIMARGINATA Dali, 1917. 
Proc. U. S. Nat. Mus., vol. 53, p. 473. 
Monterey, California, to Puerto Libertad, West Mexico. 
DENTISCALA NESIOTICA Dali, 1917. 
Proc. U. S. Nat. Mus., vol. 53, p. 473. 
Catalina Island, California. 
Subgenus Nodiscala De Boury, 1889. 
NODISCALA SPONGIOSA Carpenter, 1864. 
Proc. Cal. Acad. Sci., vol. 3, p. 222 ; Suppl. Rep. Brit. Assoc., p. 660. 
Off Oregon coast in 50 fathoms to Monterey, California. 
NODISCALA RETIPOROSA Carpenter, 1864. 
Proc. Cal. Acad. Sci., vol. 3, p. 222 ; Suppl. Rep. Brit. Assoc., p. 660. 
Catalina Island, California, to Gulf of California. 
. Subgenus Aciesa Morcli, 1857. 
ACIRSA BOREALIS (Beck) Lyell, 1839. (Plate 13, fig. 10.) 
Rising of Sweden, p. 37, pi. 2, figs. 11-12. 
Aleutian Islands, Alaska. Circumboreal. 
ACIRSA BOREALIS OCHOTENSIS Middendorff, 1849. 
Mai. Rossica, vol. 2, p. 98 ; Sibirische Reise, p. 213, pi. 12, figs. 12-14. 
Arctic Ocean near Bering Strait, Bering Sea, and the Okhotsk Sea. 
Subgenus Boreoscala Kobelt, 1902. 
BOREOSCALA GREENLANDICA Perry, 1811. 
Conchology, pi. 28, fig. 8. 
Arctic Ocean near Point Barrow and southward on the v/est to northern 
Japan ; on the east to Wrangell, Alaska. Circumboreal. Also Pliocene. 
Subgenus Aspeeoscala De Boury, 1909. 
ASPEROSCALA BELLASTRIATA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 660 ; P^oc. Cal. Acad. Sci., vol. 3, p. 221, 1866. — 
Arnold, Pal. San Pedro, pi. 9, fig. 17. 
Monterey to San Diego, California. 
ASPEROSCALA LOWEI Da!I, 1906. (Plate 6, fig. 11.) 
Nautilus, vol. 20, No. 4, p. 44. 
Catalina Island, California. 
ASPEROSCALA COOKEANA Dali, 1917. 
Proc. U. S. Nat. Mus., vol. 53, No. 2217, p. 475. 
San Diego, California. Ao 
ASPEROSCALA ARNOLDI Dali, 1917. 
Proc. U. S. Nat. Mus., vol. 53, No. 2217, p. 475. 
San Pedro, California. 
