THE NAUTILUS. 105 



nices lewisii with 7 Crepidula excavata Brod. on it washed in 

 after a storm. 



The territory covered by this list is quite limited. It includes 

 about 2 miles of shore along the Bay and a short distance along 

 the ocean-front on either side of the narrow entrance of the 

 Bay. A total distance of 3 miles of shore. 



All the species listed have been collected within the last three 

 years, most of them by Mrs. Chace and myself. A few were 

 collected by Mrs. J. E. Herbst, Mr. Valentine Herbst and Mr. 

 Otto Kiem of Seal Beach. 



A HOME MADE VIVARIUM. 



BY LILLIAN DYER THOMPSON. 



I am having such success "with a vivarium which I made that 

 I thought perhaps some other conchologists might like to make 

 some so that they, too, could study more closely the living 

 animal, and become acquainted with the way they eat, walk, 

 build their shells, etc. 



I first bought a large roasting pan and a smaller pan that was 

 as long as the other wide. These cost me twenty cents. Then 

 I had a box made that the bigger pan would snugly fit and had 

 it made six inches deep. The cover was of a fine-meshed wire 

 netting fastened to a hinged frame. The box, of |" spruce 

 stock, was made at odd moments and cost me twent3'-five cents. 



In one or two places, where the larger pan did not fit the 

 case, I stuffed the cracks with wadded paper. Then I put the 

 smaller pan across one end of the larger and filled any cracks 

 with moss and earth. 



I put a tuft of grass (which I shall supplant with a fresh- 

 water alga soon) and a dead Busycon shell that I had washed 

 to remove all traces of salt, which I have been told is injurious 

 to snails. I then partially filled the pan with water, and my 

 little fresh-water pond was ready for occupancy. 



The remainder of the larger pan I filled with moss and 

 bunches of grass containing growing plantain (of which the 

 snails are very fond). As some snails love to hide under dead 

 leaves, I put some in for them, and I also put in a stick that 



