106 



THE NAUTILUS. 



formed a stairway from the moss to the cover. I knew that the 

 snails would want some lime to aid them in constructing shell- 

 forming material, so I put in a Modiola after I had washed it. 



I gave them corn meal on half a scallop shell and put a 

 Polynices shell full of water beside it, sinking the shell into the 

 earth until the lip was level with the surface. The snails are 

 very fond of corn meal ; they also relish lettuce and cabbage 

 leaves, green grass, plantain, and all succulent weeds. 



As I live in Cambridge, Mass., where limestone formations 

 are scarce, I have had largely to depend upon the kindness of 

 others for my pets. As I have received quite a few specimens 

 through the mail, I thought others might want to do the same ; 

 so will, in as few words as possible, tell how mine were sent. 

 Some came way from California in a tin box, with a little grass. 

 As they could not get much air, they built epiphragms over 

 the apertures, which they broke down soon after they were put 

 in the vivarium. The majority were sent with a little grass or 

 lettuce in pasteboard or wooden boxes (which are the only 

 things to send specimens in, as they can breathe freely). 



In closing, I shall give a list of species that I now have in 

 my vivarium, with the localities. Those with the asterisk (*) 

 have raised families since they came. 

 Lymnaea palustris Mull, from Livingston Co., Michigan. 

 Campeloma decisum Say *, from Shawsheen River, Bedford, 

 Mass. 



Physa heterostropha Say * from Shawsheen River, Bedford, 

 Mass. 



Planorbis antrosus Conrad * Shawsheen River, Bedford, Mass. 

 Succinea ovalis Say * Waverly, Mass. 

 Epiphragmophora tudiculata Binn, near Los Angeles, Cal. 

 Polygyra tridentata Say, Livingston Co., Mich., and New York 

 City. 



Polygyra thyroides Say, Livingston Co., Mich., and Upper 



Montclair, N. J. 

 Polygyra multilineata Say, Livingston Co., Mich. 

 Polygyra monodon Rach., Livingston Co., Mich. 

 Polygyra albolabris, Blue Hills, Mass. 

 Polygyra thyroides Say, Middlesex Fells, Melrose, Mass. 

 Zonitoides arboreus Say, Middlesex Fells, Melrose, Mass. 



