OF CONCHOLOGY. 199 



NOTES ON WEST COAST LAND SHELLS. 



No. II. 



BY J. G. COOPER, M. D. 



The last article by me on this subject, published in Vol. IV, 

 Part 4, p. 211, gave a sketch of the distribution of Ilelicoid 

 land shells as known to me up to August, 1868, with some notes 

 on other relations of the species.* 



I now propose to give such additional information on all the 

 land shells as has accumulated since the writing of previous 

 articles. 



My synopsis in the Proc. Cal. Acad. Sciences, Sept., 1867, 

 gave 55 species of Helicoid shells west of the Rocky Mountains, 

 between latitudes 49° and 33° north. I can now add two new 

 species from Nevada and Utah, two from California (one of a 

 new genus), two more new to this State, and also define five 

 well-marked varieties or subspecies. The recent annexation of 

 Alaska has also added one or two to the west-coast fauna, besides 

 a Vitrina and a Zua, first enumerated as such by R. E. C. 

 Stearns in the Proc. Cal. Acad, iii, 384, and published May, 

 1868. A new Californian Leucocheila is also indicated. 



The measurements here given are in hundredths of an inch, as 

 in my Synopsis. 



Additions to the west-coast list since 1867 have their names 

 printed in small capitals. f 



With respect to the classification of mollusca by characters 

 derived wholly from their soft parts or the internal organs, I 

 may remark that too much importance seems to be attached to 



* Previous papers by me, relating to them, are, tbe " Geographical 

 Catalogue of West Coast Mollusca," April, 1867, and others ia Proc. Cal. 

 Acad. Sciences, vol. ii, pp. 62, 259, 294, 331. 



f The map accompanying the article on Distribution in Vol. IV was 

 engraved without my seeing a proof, and the artist has omitted most of 

 the reference marks given in the explanation on p. 238. A close attention 

 to the account of localities, etc., will, however, generally make up for this 

 unfortunate omission. 



