THE NAUTILUS. 95 



water, fall in upon themselves at tlie moment of low tide. They be- 

 come empty then by the rents in their exterior; but, in virtue of 

 their elasticity, they fill up again with air. At the return of the 

 tide, they thus form a float more than sufficient to raise up the oyster 

 that serves them as support. Therefore at each great tide, when the 

 beds are wholly uncovered, the oysters are seen to disappear in the. 

 oiling upon this automobile algae. 



According to M. Bornet, we have the Colpomenia sinuosa, abound' 

 ing notably in the Mediterranean in the tracts adjacent to the At- 

 lantic. It was pointed out for the first time at Cadiz at the begin- 

 ning of the last century, and has never been seen farther north. It 

 no doubt came upon the hull of a vessel, and, having found in the 

 gulf of Morbihan suitable water, it multiplied there. 



Hitherto no other effective means has been found of combating 

 this alga than to sweep the beds with prickly fagots. It is to be 

 hoped that a rigorous winter will be sufficient to cause it to dis- 

 appear. — Scientific A merican. 



British Columbia Smells. — Mr. Stewardson Brown, of the 

 Academy of Natural Sciences of Philadelphia, collected the follow- 

 ing species of land shells while on a botanical expedition in the 

 Canadian Rocky Mountains. At Field, B. C : Thysanophora in- 

 gersolli Bid., Vertigo gouldii Binn, Vertigo v. elalior Sierki, Vertigo 

 modesta Say, with the form parietalis Anc, Vitrea hammonis Stib'm, 

 Vitrea biimeyana Mse., Eucomdus /ulcus Drap., Zonitoides arborea 

 Say, Pyramidula c. anthonyi Pils., Sphy radium edentulum Drap., 

 Succinea avara Say, and at Banff', Alberta : Vertigo modesta Say, 

 Vitrea biimeyana Morse, Eucomdus fulcus Drap., Pyramidula c. 

 anthonyi Pils., Sphyradium edentulum Drap E. G. Vanatta. 



Additional Localities for Helix bortensis Since the 



publication of my article on the distribution of Helix bortensis in the 

 November Nautilus, I have received the following additional 

 records. From Curtain Island, Richmond Bay, Prince Edward 

 Island, a specimen of the plain yellow variety was received by Rev. 

 Henry W. Winkley from a Mr. Ives. In 1902 Mr. Geo. II. Clapp 

 collected the banded variety (!2oA.')) at Cape Porpoise, about three 

 miles from Kennebunkport, Maine. .Mr. Francis N. Balch has found 

 it at Orleans, Massachusetts, and also at Cohasset. 



