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 

 sequilaterale*) . These were found at Pacific Beach and no doubt 

 exist within the limits of La Jolla, if one will search with care. 



Helix trasJcii Newc. 



Helix tudiculata Binn. 



These are apparently not rare in the environs of La Jolla. 

 The first was not previously reported. 



Helix aspersa Miill. 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 calif ornianus. Modiolus calif orniensis 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. 



