OF CONCHOLOGY. 213 



Very little has been fully recorded on the distribution of our 

 snails. The works of Lea, A. Binney, Gould, and W. G. Binney 

 contain only the localities of species as noted by collectors, and 

 several errors occur in these. Dr. W. Newcomb published the 

 result of his collections on this subject in the Amer. Jour. Conch. 

 I, 4, 1865, and II, 1, 1866, but he -had visited but few of the 

 localities mentioned by him, and the collectors from whom he 

 derived his information had evidently confused the facts in some 

 instances ; there are also several errors noticeable, while much 

 more information may be added. Having myself collected since 

 1853, from lat. 49° to Mexico, and from the Rocky Mountains 

 to the Pacific, I propose to give the result of my own observa- 

 tions, together with those of a few trusty collectors, noted down 

 from their own lips or pens. 



* In the "Geographical Catalogue of Mollusca " of the West 

 Coast, 1867, I gave only the extremes of range north and 

 south as I then knew them. I now give notes particularly 

 on the localities and conditions under which they exist, com- 

 mencing at our southern boundary, the line between Upper and 

 Lower California. Mr. Gabb's thorough reconnoisance of the 

 latter peninsula shows that its land-shells all differ from those 

 found in this State. Although his H. Stearnsiana may be yet 

 proved to be but a variety of Kellettii, still it is a marked one, 

 and worthy of distinction as a local race, if nothing more. No 

 other species found by him occurs at San Diego or elsewhere 

 within the United States, the Rowellii having probably come 

 from Lower California or Mexico, instead of Arizona.f 



The Califoknia Helicine Fauna. 



San Diego. — The point of land forming the western side of 

 the harbor, called Point Loma, is two hundred feet or more in 

 height, about six miles long and one wide. It is without any 

 permanent surface water, and exceedingly dry during eight 



* The extent of the United States and Territories west of the Rocky 

 Mountains is about equal to the portion east of the Mississippi. 



t In my " West Coast Helicoids,'' misunderstanding Dr. Newcomb's 

 description of this species, I suggested that it might be of the levis type. 

 The figure in Tryon's Monograph shows that it is closely allied to Lohrii, 

 Gabb, and he remarks that his dead shells show " minute punctations, as 

 if the living shells were hirsute." The subangulate form of both species 

 indicates the same thing, and the band of Lohrii shows its affinity with 

 our California series. I now think that they bear a similar relation to 

 the true Remondii, Tryon, and the species or. variety called Remondii 

 by Gabb, that infumata does to fidelis, HMebrandi to Mormonum, &c. 

 (See remarks farther on). Mr. Gabb's Lohrii was found by him only 

 in the southern part of the peninsula extending south of Remondii. 



