CONTENTS. 



Page 



Limitation of the Family Asta< id.e . . 1 



Diagnosis of the Family Astacid^e 1 



Division of the Family into two Subfamilies, Potamop.ii.ni: and PabastaciNjE 2 



Division of the PotamobiiNjB into two Genera, Cambaeus and Astacus . 2 



The Genus Cambaeus 3 



Bibliography of the Genus Cambaeus feom the Yeae 1*08 to the Pres- 

 ent Time ............. 4 



Notice of IIagen's Monograph of the North American Astacid^e . 8 

 Hagen's Notes on the Types of Erichson's and De Saussure's Species 



of Cambaeus in the Berlin Museum 9 



Notice of the extant Types of Cambaei described by American Authors 



before the Date of IIagen's Monograph 10 



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



Indications of Hermaphroditism in Cambaeus 12 



Peculiarities of the Young Stages of Cambarus 15 



Bank of the Subfamilies Potamobiin^e and Parastacin\e, and of the 



Genera Cambaeus and Astacus 16 



Division of the Genus Cambaeus into five Subordinate Groups . . 10 

 Systematic Account of the Species of Cambarus, with their Synonymy 



and Geogeaphical Distribution .... ... 17 



Group I. (Type, C. JSlandingii) 17 



Group II. (Type, C. advt na ) 47 



Geoup III. (Type, O. Bartonii) 59 



.Group IV. (Type, C. affinis) 85 



Geoup V. (Type, C. Montezuma) 121 



The Gen is Astacus 125 



The Subgenus Cambaroides 120 



Systematic Account of the Species of Cambaroides . . . . [28 



The Nobth Ameeican Astaci l:;o 



Systematic Account of the North Ameeican Species of Astaci s . 131 



The Eueopean Astaci ... % 137 



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



Note on the Fossil Astacid.e 154 



