C CONTENTS. 



Page. 

 APPENDIX E— Continued. 



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



A. Obstructions in the rivers of Maine — Continued. 



Orange River 618 



East Macliias River 618 



Machias River 618 



Wescougus or Pleasant River 618 



Narraguagus River 618 



Union River 618 



Penobscot River and tributaries 618 



Saint George River 619 



Medomac River t 619 



Damariscotta River 619 



Sheepscot River 619 



Kennebec and tributaries 619 



Presumpscot River 621 



Saco River and tributaries 621 



Mousaui River 621 



Salmon Falls River 621 



B. Obstructions in the tributaries of Lake Champlain. 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. McKeunie 629 



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



J. F. Ingalls 630 



Pensaukee River 630 



Oconto River 630 



Peshtigo River 630 



Menomouee River 630 



Cedar River 631 



Barque River 631 



Ford River 631 



Escauaba River 631 



Whitefish River 632 



Sturgeon and Fish Dam Rivers 632 



Monistique River 632 



SeulChoix 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. Synopsis of the higher fresh- water Crustacea of the Northern United States 637 



Macrura 637 



Family Astacida^ 637 



Family Pakemonidie 640 



Family Peuteidaj 642 



Schizopoda 642 



Family Mysidro 642 



Amphipoda 645 



Family Orchestidixs 645 



Family LysianassidjB 647 



Family Gammarida? 651 



Isopoda 657 



Family Asellidic 657 



