EXPLANATION OF THE PLATES. 
PLATE I. 
Fig. 
1. The metatarsus and tarsus of Ciniflo atrow, exhibiting the 
calamistrum: a, the upper row of spines; }, the lower row 
of spines; c, the spur at the extremity of the apparatus. 
2. The metatarsus, very highly magnified: a, the upper row of 
spines ; 6, the lower row of spines ; ¢, the spur. 
3. The extremity of the tarsus of the right anterior leg of Epeira 
diadema, exhibiting the claws. 
4. A lateral view of the extremity of a posterior tarsus of Sal- 
ticus scenicus: d, the appendages constituting the scopula or 
climbing-apparatus. 
5. An appendage from one of the tarsal brushes of Mygale 
avicularia. 
6. A compound hair from a leg of Tegenaria eivilis. 
