loo Journal of Comparative Neurology. 



a hole in the wall. Main sheet extends from the ledge upwards, 

 at an angle of fifteen degrees, to a lateral prolongation of the 

 rock that forms the roof of the hole. Thus we have gradual 

 incline, passing from a lower to a higher ledge. A portion ot 

 this sheet extends into the hole and forms a carpet in the same. 

 Gallery hidden under the stone at the top of the incline. Guard 

 web on the outer side very high, attached to the stones above 

 the web. Snares absent. 



This is a remarkable web. Those who run may read that 

 it serves a double purpose. The high guard web insures the 

 capture of insects that attempt to fly out of the hole ; while to 

 walking insects the gentle incline forms a tempting bridge by 

 which to pass from ledge to ledge. Once on the web the spider 

 claims them for his own. Note also that the position of tlie gal- 

 lery is such as to render it invisible from either the hole or the. 

 ledge. Is this web the result of mere instinctive construction ? 

 I think not. Here an individual has built differently than the 

 remaining individuals of the same species. Here again an indi- 

 vidual has transcended instinct and entered the arena of intelli- 

 gence. 



The main sheets of all the webs so far considered are single. 

 I have noticed five cases where the main sheet was compound. 

 For the sake of completeness I give them all. 



Example XV. — Panel of door. Main sheet attached to 

 side and back of panel. This sheet consists of two divisions. 

 The first portion slants downward, at an angle of about fifteen 

 degrees, along the back of the panel for quite a distance. Here 

 the second division begins and passes upward at the same angle 

 until it reaches the level at which the first division began. Gal- 

 lery in the angle. Guard web high. Snares abundant. 



Example XVI. — Location: log pile. Main sheet stretched 

 over the logs. It consists of two divisions. One half is nearly 

 horizontal, the other slants upwards at quite an angle. Gallery 

 piercing the centre of the web, from below. Guard web absent. 



Example XVII. — Location: log pile. Main sheet consists 

 of two parts. One portion is horizontal and flat, and attached 

 to two intersecting logs. The other portion resembles an in- 

 verted, triangular Japanese cap. This portion is continuous 

 with the first division, but it is attached to weeds instead of logs. 



