50 



2555 Zonitoides alliaria Drap. 



1864 Zonitoides arboreus 



1866 Zonitoides selenitoides 



1867 Zonitoides minusculus 



1868 Zonitoides laeviusculus 



1869 Zonitoides milium pugetensis 

 2006 Zonitoides neomexicanus 



1359 Zonitoides (Pseudahyalina) pugetensis 



1956 Zonitoides Randolphi 



1865 Zonitoides limatulus 

 2720 Zonitoides milium 







LITERATURE 



2232 Arnold, Ralph, and Harold Hannibal: The marine tertiary 

 stratigraphy of the north Pacific coast of America. Am Phil 

 soc pr 52:559-605, pi 37-48, 1913. 



2233 Arnold, Ralph: Descriptions of new cretaceous and tertiary 

 fossils from the Santa Cruz mountains, California. U. S. Nat'l 

 Mus pr 34:345-390, pi 31-37. Wash. 1908. 



2234 Arnold, Ralph: New and characteristic species of fossil 

 mollusks from the oil-bearing tertiary formations of Santa 

 Barbara county, California. Smithsonian misc coll 50:419- 

 447, pi 50-58. 1907. 



1991 Ashmun, E. H. 



Collecting in Arizona and New Mexico. Nautilus 13:13-17. 

 2579 Bailey, Jr., Joshua L. 



Shells of La Jolla, Cal. Nautilus 21:92 (list of species omitted 

 from above list that he has collected). 

 2372 Baker, Frank C: 



Northern Idaho shells. Nautilus 27:104. 

 2041 Baker, Fred, 



Cruising and collecting off the coast of Lower California. 

 Nautilus 16:25-29. 



List of shells of San Martin Island, Lower California. Nau- 

 tilus 16:40-43. 

 2060 Baker, Fred. 



Shell collecting in Puget Sound and Alaska. Nautilus 24: 

 25-31, 44-47. With list of shells collected. Includes Nos 2061- 

 2079. 



2236 Bartch, Paul: See John B. Henderson. 

 564 Bartsch, Paul: 

 3110 Bartsch, Paul: 



The recent and fossil mollusks of the genus Diastoma from 

 the West Coast of America. U. S. natl mus pr 39:581. 

 2658 Bartsch, Paul: 



Notes on the genus Sonorella, with descriptions of new species. 

 Smith Misc Coll 47:187-200, t 28-33. Notes on Nos. 2659-2670; 

 also describes Fisheri, Baileyi and variety Orcutti, Dalli and Ash- 

 muni. 

 574 Bartsch, Paul: 



West American mollusks of the genus Triphoris. U. S. nat. 

 mus. pr 33:249-262. Treats of the species following under num- 

 bers 575-590. 

 593 Bartsch, Paul 



New mollusks of the family Vitrinellidae from the west coast 

 of America. U. S. nat, mus pr 32:167-176, figures. Describes the 

 following, numbered 594-604. 

 2983 Bartsch, Paul: 



The recent and fossil mollusks of the genus Cerithiopsis from 



