ORDER PULMONARLE. 
403 
and advanced, and whose jaws are straight, and dilated at the 
insertion of the palpi. 
Filistata, Lair ., 
Which have eight eyes grouped on a little elevation at the an- 
terior extremity of the thorax, the forceps small, and the jaws 
arched at the external side, and surrounding the tongue as a 
centre. 
We now pass to the araneides which have but a single pair 
of pulmonary sacs and stigmata. All present palpi with five 
articulations, inserted on the external side of the jaws, near 
their base, and most frequently in a sinus ; a tongue advanced 
between them, either almost square, or triangular, or semi- 
circular; and six nipples or spinnerets at the anus. The last 
articulation of the palpi of the males is more or less ovoid, and 
encloses, most frequently, in an excavation, a complicated and 
very varied copulatory organ. Rarely (Segestria) it is un- 
covered. 
With the exception of a small number of species, entering 
into the genus mygale, they compose that of 
The Spider, Aranea of Linnaeus, or Araneus of some 
writers. 
A first division will comprehend the Sedentary Spi- 
ders. They make webs, or at least send forth threads, to 
surprise their prey, and remain habitually within those snares, 
or close beside them, as well as near their eggs. Their eyes 
are approximated on the breadth of the forehead, sometimes 
to the number of eight, four or two of which are at the middle, 
and two or three on each side ; sometimes their number is six. 
Some, which in walking always proceed straight forward, 
and which we name on that account Rectigrades, weave 
webs, and are always stationary. Their feet are elevated in 
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