C CONTENTS. 



Page. 

 APPENDIX E— Continued. 



XXIV. On obstructions to the ascent op pish— Continued. 



A. Obstructions in the rivers of Maine — Continued. 



Orange River 618 



East Machias River 618 



Machias River 618 



Wescongus or Pleasant River 618 



Narraguagus River 618 



Union River 618 



Penobscot River and tributaries 618 



Saint George River 619 



Medomac River 619 



Daniariscotta River 619 



Sheepscot River 619 



Kennebec and tributaries 619 



Presumpscot River 621 



Saco River and tributaries 621 



Mousara River 621 



Salmon Falls River 621 



B. Obstructions in the tributaries of Lake Champlaiu. By M. C. Edmunds. 622 



Lake Champlain 622 



Saint Lawrence River and Lake Ontario 627 



C. Obstructions in some of the rivers of Virginia. By M. McKennie 629 



D. Character of the streams on the northern shore of Lake Michigan. By 



J. F. Ingalls 630 



Peusaukee River 630 



Oconto River 630 



Peshtigo River , 630 



Menonionee River 630 



Cedar River 631 



Barque River 631 



Ford River 631 



Escanaba River 631 



Whitefish River 632 



Sturgeon and Fish Dam Rivers 632 



Monistique River 632 



Seul Choix River 632 



E. Characters of some of the northern tributaries of Lake Michigan. By 



James W. Milner 632 



APPENDIX F.— NATURAL HISTORY 635 



XXV. The Crustacea of the fresh waters of the United States. By 



Sidney I. Smith 637 



A. Synopsisof the higher fresh-water Crustacea of the Northern United States 637 



Macrura 637 



Fanaily Astacidie 637 



Famil}^ Paltemonidaj 640 



Family Penoeidaj 642 



Schizopoda , 642 



Family Mysidre 642 



Amphipoda 64.5 



Family Orchestidie 645 



Family Lysianassidas 647 



Family Gammaridre 651 



Isopoda 657 



Family Asellidre 657 



