TALI THUS LOCUSTA. 
19 
food from fixed positions — a circumstance, according to 
Leach, from which it has earned the specific name of 
Locust a. 
The first pair of legs are simple, the terminal joint 
being slightly curved, but not having the power to 
impinge against the preceding. They are strong and 
efficient for the purpose of burrowing or hooking to any 
substance, but have no prehensile capability. 
The second pair of legs are feeble, of a membranous 
appearance, and generally lie folded up close beneath the 
body. The terminal joint is short, almost obsolete, and 
placed at a considerable distance from the extremity of 
the preceding, appearing to be an inefficient organ.* 
The two next succeeding pairs of legs are strong and 
efficient members for perambulation, but they are not so 
powerful as the last three pairs. 
The first or scale-like joint affixed to the sides of 
the body, is largely developed in each leg. That of the 
fifth pair of legs is bilobed, and is anteriorly nearly as 
deep as the one that precedes it. 
The swimming fins are short, being never required, 
since the animal never voluntarily seeks the sea. The 
lateral appendages of the tail are short and stout. These, 
with all the other limbs except the second pair of hands, 
are furnished with fasciculi of short, spine-like hairs. 
These hairs are generally blunt at the tip, and furnished 
laterally with a slight secondary appendage, about one- 
* In Milne-Edwards’ figure of the male of T. saltator , stated to hare been 
copied from the living specimen (R. An. Ed. Crochard, Crust., pi. 59, fig. 2a), 
the second pair of legs is represented as evidently larger than the first pair, 
but destitute of spines. This figure, therefore, appears to us rather to repre- 
sent Talitrus Beaucoudraii of M. -Edwards. 
It must be borne in mind that, throughout the Amphipodous portion of 
this work, the limbs on one side of the body are alone represented, in order 
to prevent confusion ; the opposite limbs being identical in structure. 
