HORIZONTAL SNARES AND DOMED ORBS. 153 
arrangement of the unbeaded and notched spirals (mn) is represented. If 
one will imagine a web thus constituted throughout the entire orbicular 
space, and hung in a pretty 
site among meadow plants 
or wild flowers, he will have 
a true conception of the del- 
icate beauty of this work of 
aranead art. 
In appearance the orb 
resembles that of Acrosoma. 
The open hub, 
Orb the numerous spi- 
Shares: rals, and the nu 
teristics. ~“"” * Nee 2 
merous and deli- 
cately spun radii and bead- 
ed spirals are characteristic 
of Hortorum, as they are 
of Acrosoma. But I have 
never seen in Hortorum any 
of the ribboned decorations 
which mark the spinning- 
work of Acrosoma. The free 
space also is decided in Hor- 
torum, but small or lacking 
in Acrosoma. When dis- 
turbed the spider usually 
runs along the dragline to ic. 143. Section of foundation lines and orb of the Orchard 
which she hangs underneath eens ia 
the hub, to the remotest part of her foundation lines, with which the drag- 
line is generally connected. She remains stationary. at her point of refuge, 
or hides beneath a leaf, or sometimes drops to the earth. 
I have never seen the snare of Hortorum in a vertical position, and 
have rarely noticed it inclined in any degree from the horizontal; but have 
record of one web that inclined about forty-five degrees. In this orb the 
foundation lines were attached to the leaves of a plant eighteen inches high, 
upon which the snare was hung. From these, 
retitelarian lines were carried downward to an 
adjoining tree, making a rude appearance of an 
inverted pyramid. ‘This apron was not carried up 
close to the orb, but separated from it about the 
Vic. 144, Central section of Or- ‘ ae 7 : pe i z 
chard spider’s orb. f, free space ; distance of five or six inches. This is the ordi- 
my notched zone; c,open hub. nary position of the apron, and in this respect is 
quite analogous to the corresponding situation of orb and labyrinth in the 
snare of Epeira labyrinthea. Indeed, it may be said as a general fact that 
