64 THE NAUTILUS. 
mile in extent in any direction. The authorities attempted 
their destruction, but I have noticed hundreds yet remaining 
alive. It was first reported to our local society of natural his- 
tory in 1914, when three specimens donated were ‘‘all that 
could be found.”’ 
Bifidaria hemphilli. 
Bifidaria calamitosa. 
Vertigo californica diegoensis. 
Some years ago Mr. Henry Hemphill told me that there were 
no Pupas in this region, stating as his belief that they could 
not exist in our arid climate. Then I found a few under the 
stem of a decaying yucca on the mesas back of San Diego, and 
later more than 500 under some decaying cacti in the same 
vicinity. Still later individuals were found not at all rare on 
decaying plants on the seashore not far south of La Jolla, chiefly 
on the Hottentot Fig or Beach Strawberry (Mesembryanthemum 
zquilaterale). These were found at Pacific Beach and no doubt 
exist within the limits of La Jolla, if one will search with care. 
Helix traskii Newe. 
Helix tudiculata Binn. 
These are apparently not rare in the environs of La Jolla. 
The first was not previously reported. 
Helix aspersa Mill.—Mr. Smith reports that he turned a few 
dozen of these loose at La Jolla. They now exist by the tens 
of thousands and are very destructive to the vegetables in the 
gardens. Some way should be found to make Mr. Smith take 
them away. It seems to be a different form from the one now 
naturalized in San Diego gardens, where it is also a much hated 
pest. 
Mytilus californianus.—Modiolus ecaliforniensis of Smith’s list 
was doubtless an error for the above, which occurs plentifully 
on our coasts. Just south of the international boundary this 
species has yielded many pretty pearls. The larger shells 
measure about seven inches long. 
Schizothaerus nuttallii.—This favorite clam was formerly 
abundant in a bed of rocks just inside the entrance to False 
Bay, which was formerly the home of many choice shells. This 
was the type locality of Chlamydoconcha orcutti, since reported 
from Monterey Bay by Dr. Berry. 
