Xl HABITS AND STATIONS. 



larger shells seem scarce and hard to find. Only small or 

 minute shells are really abundant, and these only in spots. 

 I would say that in Cuba, the same amount of work would 

 result in at least ten times as many large shells as in Oahu, 

 while the number of small ones would be about the same. In 

 southern Arizona, one could not expect more l i live ' ' shells in 

 a day's work than in Oahu or Molokai, if so many; and the 

 number of species would be smaller. Helicina, Succinea, 

 Philonesia, Tornatellinidce and Leptachatina are usually 

 rather abundant. Pupttlidce and Endodonta often abundant, 

 but very much more local. 



It is easy to understand the genesis of arboreal snails 

 when one sees the conditions in such humid forests as those 

 of Hawaii, where the rainfall totals one to two hundred 

 inches. Snails of all kind Helicinidce, Zonitidce, Endo- 

 donts, Amastras, Pupillidce wander freely over the herb- 

 age and tree-trunks. There is no need for them to stay close 

 to the damp earth and under cover, as in dryer climates. 



Achatinellas are usually cleaned by "squirting" without 

 cooking. A small nozzle attached to a faucet gives a good 

 stream for the purpose, or a syringe may be used. Hot water 

 changes the green color to a dirty olive or brown. The chemi- 

 cal relations of green and brown must be very intimate. 

 White shells or those with dull colors, like Partulina, Amas- 

 tra and many others, may be boiled without detriment to 

 the colors. As a rule, Achatinellida, Amastridcc and Auri- 

 culella pull easily. Living Achatinellas are daintily clean and 

 bright; and of course no oil or anything else should be put 

 on the shells to improve or preserve the colors. 



The numerical preponderance of arboreal Achatinellidc? 

 in the Island faunas has been much exaggerated. The actual 

 number of species known is less than one hundred. The 

 genera Amastra and Leptachatina both outnumber the tree 

 shells. Leptachatina will eventually prove to be far the most 

 prolific genus in the fauna, in the opinion of Dr. Cooke, who 

 has given it special attention. Kauai and Maui will doubt- 

 less turn out many new species of Amastridce, and in Maui, 

 Achatinellida also. Hawaii especially the Kona side is 



