OLA Pan. 
MEMORY, MIMICRY, AND PARASITISM. 
I 
Aw interesting example of the power of spiders to adapt themselves 
_ and their industry to circumstances occurred under my observation in the 
case of a Turret spider, Lycosa arenicola. Wishing to preserve 
aes a2 nest to study the life history of its occupant, I carefully took 
Tamoee up the sod containing the tube, carrying away with me several 
inches in depth of the burrow. ‘The upper and lower openings 
were plugged with cotton to retain the spider during transit. Upon arrival 
of the nest in Philadelphia 
the cotton plug guarding the 
entrance was removed, but 
the other was forgotten, and 
thus allowed to remain. The 
nesf with the enclosing sod 
was imbedded in the soil in- 
side of a tub, and the spider 
left to work out naturally its 
industrial instinets. It im- 
mediately began removing 
the cotton at the bottom of 
its burrow, and cast some of 
it out upon the surface. But 
finally, guided, apparently by 
its sense of touch, to the 
Fic. 38. Cotton lined nest of Turret spider. knowledge that the softer 
fibres of the cotton would be an excellent material with which to line its 
tube, she put it to that use, and had soon spread a smooth layer over the 
inner surface and upon the opening. In this manner the interior was 
padded for about four inches from the summit of the tower downward. 
It may be taken for granted that this Turret spider for the first time had 
come in contact with such material as cotton, and had immediately utilized 
its new experience by substituting the soft fibre for the ordinary silken 
lining, or rather by adding it thereto. This nest, with the cotton wadding, 
is represented at Fig. 38. The cotton was distributed quite evenly over the 
(44) 
