~" )yj [May 16, 



copper from the Calumet and Ilocla mine, Lake Superior, 

 and explained its appearance on the supposition that it had 

 been subjected to a sliding pressure between the two walls 

 of a fissure, thus representing a phase of slickensides. 



Prof. Cope presented a paper entitled, "Notes on some 

 landshells of the Pacific slope, by J. G. Cooper, M. D. 



Mr. Lesley exhibited a slab of limestone full of Trenton 

 trilobites, given nine years ago to Dr. Isaac Lea by Mr. S. 

 Emlen Sharpies, of Bucks County, Pennsylvania, who took 

 it from the walls of a limekill at a quarry near Greenville, 

 on the north edge of the belt of limestone rocks (enclosed in 

 Mesozoic) 3000 feet thick, and dipping northward. 



The slab is given by Dr. Lea to the Museum of the 

 Geological Survey, and is valuable in evidence of the pres- 

 ence of the Trenton formation in a range over which dis- 

 cussions have been and are still taking place. It is of es- 

 pecial interest just now in view of the late publications of 

 Prof. J. D. Dana, on the new localities of Trenton fossils 

 around Poughkeepsie, east of the Hudson river. 



The minutes of the last meeting of the Board of Officers 

 were read. 



Pending nominations Nos. 878 to 883, and new nomina- 

 tion No. 884 were read. 



The Treasurer moved the following resolution, which was 

 adopted : 



Resolved, That the Treasurer be authorized to execute under the seal of 

 ihe Society a transfer of the certificate of $3000 of the U. S. six per cent, 

 loan held by them, and called in by the Secretary of the Treasury. 



Dr. LeConte's resolutions of May 2, being in order of busi- 

 ness, it was, after debate, on motion of Mr. McKean, re- 

 solved that the consideration of the resolutions be postponed 

 to the second regular meeting in October next. 



On motion, leave was given to Mr. Briggs,and Dr. Barker, 

 and to Mr. Britton to withdraw their reports read at the 

 last meeting. 



On motion, an appropriation of $10 was made for sub- 

 scribing to the life of Dr. William Smith, by II. W. Smith, 



