CONTENTS 



Remarks on fragments of a large Enaliosaurian. By Prof. E. 



D. Cope 92 



Remarks on the New Sj^ecies of Osmerus (O. Sergeanti.) By 



Thaddeus Norris 93 



Description of Nine Species of Unionidse from Lake Nicaragua, 



Central America. By Isaac Lea 94 



An examination of the Reptilia and Batrachia obtained by the 



Orton Expedition to Equador and the Upjoer Amazon, Avith 



notes on other Species. By E. D, Cope 96 



Sexual Law in Acer dasycarpum Ehrb. By Thomas Meehan. 120 



On a new Mineral in Cryolite. By Theo. D. Rand.. 142 



Description of sixteen New Species of the genus Unio of the 



United States. By Isaac Lea 143 



Notes on some singular forms of Chinese species of Unio. By 



Isaac Lea 145 



List of Birds collected at Laredo, Texas, in 1866 and 1867. By 



H. B. Butcher,M. D 148 



Descriptions of four New Species of Exotic Unionidse. By 



Isaac Lea 150 



Descriptions of twenty-six New Species, of Melanid^e of the 



United States. By Isaac Lea ; 151 



