110 THE NAUTILUS. 



the snails. Their extreme sensitiveness was shown by their antici- 

 pation of a weather change from dry to wet, eight to twelve hours 

 before visible signs were given, but what seemed more remarkable 

 was the general withdrawal to shelter of all the snails during a rain 

 period two to three hours before a final clearing of the atmosphere. 



A village neighbor kept alive all summer a fine large P. alholahris 

 in a small window garden. "Alby's " mistress declared that he was 

 a most reliable barometer and that she could safely accept his weather 

 predictions. The mornings he selected for a stroll beyond the limits 

 of his garden were sure, she alleged, to be followed by thunder- 

 storms in the afternoon. 



I also observed that upon certain fair days the board sidewalks 

 were covered with CocMicopa luhrica, hundreds being crushed by 

 pedestrians. I was finally able to verify my theory that these tiny 

 mollusks left their damp retreats beneath the boards from six to 

 eight hours before rain. Indeed, I used the sign frequently to my 

 advantage to regulate my collecting rambles farther afield. 



I was unable to discover that the small and minute species living 

 habitually under bark and among debris was affected by weather 

 changes, though I have little doubt that closer observation would 

 show them to be considei-ably influenced by the amount of moisture 

 in the air. The one very noticeable exception to this was in the 

 case of Strobilops. 1 learned to look for them only in the driving 

 rain, when they all left their usual stations beneath the bark of fallen 

 trees to crawl about in the open. 



NOTE ON LUCINA (MILTHA) CHILDEENI GRAY AND ON A NEW SPECIES 

 FROM THE GULF OF CALIFORNIA. 



BY WILLIAM HEALEY DALL. 



In my synopsis of the Lucinacea (1901, p. 812) on the authority 

 of Dr. Carpenter (Suppl. Rep. Brit. Assoc.'for 1863, pp. 552, 620), 

 I stated that the Phacoides {Miltha) childreni Gray, was a native of 

 the Gulf of California and that the original ascription of it to Brazil 

 was an error. I am indebted to Dr. H. von Ihering of the Museu 

 Paulista, Sao Paulo, Brazil, for the means of correcting this state- 

 ment, which proves to be mistaken. 



