EXPLANATION OF THE PLATES. 
PLATE IX. 
First abdominal appendages of male. 
Cambarus hamulatus Fax. Form IT. 
The same. Form Il. . é P 
Cambarus Girardianus Fax. Form II. 
The same. Form II. . : 
Cambarus cornutus Fax. Form L. . 
The same. Form I. ; F 
Cambarus medius Fax.* Form I. . 
The same. Form I. : : 
Cambarus forceps Fax. Form I. 
The same. Form I. 
The same. Form II. 
The same. Form II. . : 
Cambarus Putnami Fax. Form I. . 
The same. Form I. 
The same. Form II. 
The same. Form II. . F A : : 5 : 
Cambarus spinosus Bunpy? Lauderdale Co,, Ala. Form TI. . 
The same. Form I. 5 , : ; 3 , : 
Cambarus spmosus Bunpy. Etowah River, Ga. FormII. . 
The same. Form II. . : : : ; _ 
Cambarus rusticus Grr. Yellow Springs, Ohio. Form I. 
The same. Form I. z 
The same. Form II. 
The same. Form II. . 5 
Cambarus Harrisonii Fax. Form I. 
The same. Form I. : 5 : . ; 
Cambarus propinquus, var. Sanbornii Fax. Form I. 
The same. Form I. 
The same. Form II. 
The same. Form Il. . 
PLATE X. 
First abdominal appendages of mate. 
Cambarus Sloanii Bunpy. Form I. 
The same. Form I. 
The same. Form II. 
The same. Form II. . 5 
Cambarus compressus Fax. Form I. 
The same. Form I. 
The same. Form II. 
The same. Form II. . F , 
Cambarus Alabamensis Fax. Form I. 
The same. Form I. 
The same. Form II. 
The same. Form IT. 3 : 
Cambarus Mississippiensis Fax. Form I. 
The same. Form I. 
The same. Form IT. 
The same. Form IL. . 
* The outer ramus was warped by drying when the specimen was in the artist’s hands. 
24 
185 
. X 12 
x 12 
a oe AKH) 
x 10 
x 6 
x 6 
x 6 
x 6 
%8 
xs 
x 8 
x 8 
ew 2 
x 12 
x 6 
x 6 
x6 
x6 
x6 
xX 6 
<6 
x16 
