74 THE NAUTILUS. 



cally the only portion of the entire county which drains directly into 

 the Pacific, and that, thanks to the fertile character of its soil and 

 the water available for its irrigation from the neighboring mountains, 

 almost the whole population of the county is concentrated here, 

 notably in the cities of Redlands, San Bernardino, Ontario, Chino, 

 and Colton. All are garden spots, and by the unwitting agency of 

 man most of them have come to possess a fairly extensive moUuscan 

 fauna, many species of alien origin being now far more numerous 

 than any of the native forms. 



There have been few previous records for any of the localities of 

 the region. Binney ['85] gives one or two species as being found in 

 the county, but at least one of his records is without doubt erroneous. 

 Stearns ['93] is the next author to report on specimens from our area, 

 and his records are about all we have from the great desert region. 

 The few records since that time are listed at the end of this paper. 



My thanks are due to Dr. R. H. Tremper, of Ontario, who has 

 generously supplied me with numerous specimens and data regarding 

 the fauna of his immediate neighborhood. Practically all of his 

 records are new and very interesting. I am also under obligations 

 to Miss Nina G. Spaulding, of Redlands, whose enthusiastic efforts 

 have aided not a little in increasing our knowledge. Data supplied 

 through her or through Dr. Tremper are so noted by the use of 

 their initials. I am also indebted to Mr. Sanford B. Dole, of River- 

 side, for the use of the accompanying photograph. 



List of Species. 



Helix aspersa Miiiler. Occasional around greenhouses at Red- 

 lands, but evidently not yet thoroughly at home. 



Epiphragmophora traski (Newcomb). '' Under dry leaves in 

 small foothill canon near Ontario " [R. H. T.] ; also in San Antonio 

 Canon, two miles from mouth, elevation 2500 feet [R. H. T., April 

 4, 1908] ; under leaves, Stoddard's Canon, elevation 2500 feet 

 [R. H. T., 1909]. 



This coast species apparently just enters the county as I have not 

 encountered it even in the upper end of the San Bernardino Valley. 



Epiphragmophora tudiculata (W. G. BinneyJ. Mentone, under 

 hedges ; Highland, by the roadside after a rain ; Arrowhead, Hot 

 Springs ; San Bernardino and vicinity ; greenhouse in same city 

 [R. H. T.] ; Ontario, under stones and woodpiles [R. H. T., 1908- 



