v1 CONTENTS. 
TABLE SHOWING THE GEOGRAPHICAL DISTRIBUTION OF EVERY SPECIES OF CAMBaA- 
RUS AND ASTACUS . ‘ ; A 3 : . F 4 - 
TABLE SHOWING OUR PRESENT KNOWLEDGE OF THE DISTRIBUTION OF THE NorTH 
AmeERICAN SPECIES OF CAMBARUS AND ASTACUS, ARRANGED ACCORDING TO 
STATES AND TERRITORIES . : 6 5 . 6 9 : A “ 6 
DISTRIBUTION OF THE Norra AMERICAN SPECIES OF CAMBARUS AND ASTACUS 
ACCORDING TO River SysTtEMS , , 4 5 : 5 ; ; 5 
GENERAL CONCLUSIONS DERIVED FROM THE FAcTS KNOWN CONCERNING THE GEO- 
GRAPHICAL DiIsTRIBUTION OF THE ASTACIDE , 4 j 5 c : < 
INDEX TO THE SPECIES . : : 5 ‘ , : ; ; : : 5 
EXPLANATION OF THE PLATES . : 3 : : j P 
