AKi. 17 ILLUSTEATIONS OF TYPES OF SHELLS DALL 19 



LIOTIA LURIDA Dall 



Plate 36, fig. 3 



Liotia lurida Dall, Proc. U. S. Nat. Mus., vol. 45, No. 2002, p. 590, June 11, 

 1913. 



Collected at San Joseph Island, Gulf of California, on the beach 

 by Dr. Paul Bartsch, in 1911. Diameter of shell 5 mm. 



LITTORINA GRONLANDICA Menke 



Plate 25, fig. 2 



Littorina gronlandica Menke, Synopsis, p. 45, 1830. 



Middleton I.sland, Alaska. U. S. Nat. Mns. Cat. No. 206044. 



This may perhaps be regarded as a variety of Menke's species. 



LITTORINA SITKANA Philippi 



Plate 25, fig. 7 



Littorina sitkana Philippi, Proc. Zool. Soc. London, for 1845, p. 140. 

 Sitka, Alaska. U. S. Nat. Mus. Cat. No. 206054. 



LYONSIA MAGNIFICA Dall 



Plate 23, fig. 2 



Lyonsia maf/nifica D^vll, Proc. U. S. Nat. Mus., vol. 45, p. 595, 1913. 

 Off Mazatlan, Mexico, in deep water. U. S. Nat. Mus. Cat. No. 266802. 



MACOMA ACOLASTA Dall 



Plate 8, figs. 2, 3 



Macoma acolasta Dall, West Anier. Scientist, vol. 19, No. 3, p. 21, 1921. 



Pliocene (?) of San Quentin Bay, Lower California. U. S. Nat. Mus. Cat. 

 No. 333113. 



MACTRA (MACTROTOMA) CALIFORNICA Conrad 



Plate 20, fig. 1 



Mactra caUfornica Conrad, Journ. Acad. Nat. Sci. Phila., vol. 7, p. 340, pi. IS, 

 fig. 12, 1837. 

 San Diego, Calif. U. S. Nat. Mus. Cat. No. 46912. 



MARGARITES ALBOLINEATUS E. A. Smitli 



Plate 23, figs. 3, 6 



Valvutclla alboUncata Smith, Proc. Malac. Soc. London, vol. 3, p. 206, fig. 2, 

 1898. 

 Attn Island, Alaska. U. S. Nat. Mus. Cat. No. 109463. 



MARGARITES BERINGENSIS E. A. Smith 



Plate 36, figs. 4, 6 



Valvatella ieringensis E. A. Smith, Proc. Malac. Soc. London, vol. 3, p. 206, 

 1899. 

 Petrel Bank, Bering Sea. U. S. Nat. Mus. Cat. No. 111048. 

 2000—25 4 



