^74 CALIFORNIA ACADEMY OF SCIENCES. 



Avhicli were near 1,000 feet elevation, I suppose he meant a 

 flour-mill tlien standing 51 miles N. E. of the peak at about 

 400 feet altitude, near the original locality of No. 33, and 

 where also occur other forms of No. 30. I found a great 

 colony of No. 35 near the head of the bay in 1855, and 

 some were still found there by H. P. Carlton in 1870. 



I have heard from gardeners at various places around the 

 bay, of great numbers being washed down in very wet win- 

 ters, but they often confound the damage done by Lima- 

 coids with that of the less common shelled kinds. The 

 banded Helicoids, Nos. 26 to 35, seem quite able to increase 

 in gardens and meadows, where they run into still more vari- 

 -eties, and have probably supplied the forms figured by 

 authors, which have been hard to identify. From the fre- 

 quency of the Ariontas in gardens, they are beginning to be 

 known near this bay as ''Garden Snails," and foreigners 

 have even attempted to cultivate the larger kinds for food. 

 The shell mounds left by the Indians are also favorite local- 

 ities on account of the lime; but I have never found any 

 buried in the mounds as proof that the Indians ate them. 



The drainage basin next south of Eedwood Peak, is 

 on the branches of San Lorenzo Creek, of which the 

 town of Haywards is near the centre, including about 270 

 square miles, and reaching east 15 miles. It is much drier 

 and warmer, so that most species become more rare, and 

 Nos. 25, 26 and 28 disappear. From ten years residence, 

 however, I have been able to find most of the others found 

 northward, though some are exceedingly rare. No. 2 has 

 not been introduced, nor Nos. 18, 19, 22, found, being rather 

 doubtful as east-side species 



On the other hand we find the new forms, Nos. 7, 8 and 

 13, which may all prove to be varieties of allied species 

 <3aused by the increased dryness, as they are of doubtful 

 occurrence elsewhere. Much less trees and shrubs grow on 

 the hills, chiefly in canons and on north slopes, while fossils 

 are limited to the eastern half of the hills. A few s]3ecies 



