CONTENTS. 



Tace 



Limitation of the Family Astacid^ ......... 1 



Diagnosis of the Family Astacid^ ......... 1 



Division of the Family into two Subfamilies, Potamobiin^ and Paeastacin^ 2 



Division of the Potamobiin^ into two Geneka, Cambaeus and Astacus . 2 



The Genus Cambaeus 3 



BiBLIOGEAPHY OF THE GeNUS CaMBAKUS FEOM THE YeAR 1868 TO THE PeES- 



ENT Time ............. 4 



Notice of Hagen's Monogeaph of the Noeth American Astacid^ . 8 

 Hagen's Notes on the Types of Eeichson's and De Saussuee's Species 



of Cambarus in the Berlin Museum 9 



Notice of the extant Types of Cambaei desceibed by American Authors 



before the Date of Hagen's Monograph 10 



On the two Forms of the Male in the Genus Cambaeus ... 12 



Indications op IIeemapheoditism in Cambaeus ...... 12 



Peculiarities of the Young Stages of Cambaeus 15 



Rank op the Subfamilies Potamobiin^ and Paeastacin^, and of the 



Gebteea Cambaeus and Astacus 16 



Division op the Genus Cambaeus into five Subordinate Groups . . 16 

 Systematic Account of the Species of Cambaeus, with theie Synonymy 



AND GeOGEAPHICAL DISTRIBUTION .... ... 17 



Group I. (Type, C. Blandingit) 17 



Group II. (Type, G. adcenci) 47 



Geoup III. (Type, C. Bartonii) 59 



Geoup IV. (Type, C. affinis) 85 



Group V. (Type, C. Montezumce) 121 



The Genus Astacus 125 



The Subgenus Cambaroides 126 



Systematic Account of the Species of Cambaeoides .... 128 



The North American Astaci 130 



Systematic Account of the North American Species of Astacus . 131 



The European Astaci 137 



Systematic Account of the European Species of Astacus . . . 141 



Note on the Fossil Astacidje 154 



