40 ROCHESTER ACADEMY OF SCIENCE. [NoV. 23, 



I have before me ten specimens which seem to represent this 

 species. Cumingii is a more elongate, less rounded shell than Magilus 

 antiqiius ; the spire is more or less conical and the whole shell is bullet 

 shaped, or like a minie-ball ; the longitudinal sculpture consists of 

 close set lines of growth which are raised into scales at the suture. 

 The aperture is about as long as the spire, oblong-oval in outline, 

 well rounded below and a little pointed above ; the columella is 

 rounded, smooth and covered with a heavy, wide-spreading callus. 



Some specimens of Magilus antiqtius^ with a tube just started, are 

 strongly suggestive of this species, in the somewhat raised spire. It 

 is difficult, however, to decide whether this is a deflection due to the 

 formation of the tube or is a true Cumingii. 



Leptoconchus Maillardi, Desh. PL 9, f. 7. 

 Conch. He Reunion, p. 217. 



Magilus Lamarckii, Desh., Conch. He Reunion, p. 127 t. 12, 



f. 1-3. 



Magilus solidiuscula, Pease, Sowb. in Conch. Icon., sp 12, 1872. 



This species has a pointed spire and aperture and is in a general way 

 spindle shaped. The aperture is long and pointed and about twice 

 the length of the spire ; the sculpture consists of longitudinal growth 

 lines, close set and slightly raised into scales at the sutures ; the 

 spiral sculpture consists of heavy, squamose liroe with interstices of 

 the same width as the lira^ between them ; the columellar is rounded 

 and covered with a spreading callus. 



I have before me over a dozen specimens of this species and I 

 have no difficulty in separating them at once from any of the related 

 species. In none of the specimens examined have I seen anything 

 approaching the formation of a tube as in Magilus. 



Mr. Ar iHUR L. White read a paper entitled : 



A DISCUSSION OF THE RECENT EXPERIMENTS ON THE 

 ARTIFICIAL PRODUCTION OF RAIN. 



The paper was illustrated by blackboard diagrams, maps and an 

 air pump. 



Dr. M. a. Vekdkr, Mr. Menzo Van Voorhis, the President 

 and others participated in the discussion of the paper. 



